- Chen saw cave photos and read a museum label: stalactites grow when dripping water leaves minerals. The label said one inch can take 100+ years. Based on the sources, which statement is supported?
Answer: Stalactites grow very slowly, about one inch in 100 years
This question tests 2nd grade ability to gather information from sources about slow Earth events (NGSS 2-ESS1-1: Use information from several sources to provide evidence that Earth events can occur quickly or slowly). Earth events that happen slowly occur over years, decades, centuries, thousands of years, or even millions of years—time periods so long we cannot watch them happen. Slow Earth events include: mountains forming (rocks push up over millions of years), Grand Canyon forming (river cuts through rock over 5-6 million years), rock erosion by wind and water (shapes change over hundreds to thousands of years), glaciers moving (inches per day or feet per year, shaping land over thousands of years), soil forming (rock breaks down into soil over hundreds of years), stalactites growing in caves (one inch can take 100+ years), rock layers forming (sediment becomes rock over thousands of years), and coastlines changing (waves wear away land over decades and centuries). These events change Earth's surface so slowly that we can't see changes in a day, week, year, or even in our whole lifetime. We know about them through measurements showing tiny changes, photographs decades apart showing small differences, and rock evidence showing processes took millions of years. In this scenario, the sources include cave photos and a museum label. The information shows stalactites grow from dripping water leaving minerals, with one inch taking 100+ years. Choice B is correct because it accurately states that stalactites grow very slowly, about one inch in 100 years, which matches the museum label and photos. Choice A represents a common error of incorrect time scales, which happens when students assume growth happens quickly during storms instead of over centuries. To help students gather information about slow Earth events: Explicitly teach time scale contrasts: 'Fast events: seconds, minutes, hours, days—you can watch them happen. Slow events: years, hundreds of years, thousands of years, millions of years—too slow to watch, longer than many many lifetimes.' Use visual time scales: human lifetime (80 years), 100 years, 1,000 years, 1 million years, show where slow events fall. Practice with sources: 'This book says mountains take millions of years. This photo shows tiny change in 50 years. Both sources tell us this is slow.' Create 'Slow Earth Events' chart with columns for Event, How Slow (time), Source, Why We Know It's Slow. Use comparisons: 'Earthquake lasts 2 minutes. Mountains grow over 10 million years. Which is slow?' Emphasize 'too slow to see': 'Even if you watched a glacier your whole life, you wouldn't see much change.' Show photo pairs decades apart: 'Look—only small change in 50 years. That's very slow.' Watch for students who can't distinguish fast from slow time scales, mix weather changes (fast, seasonal) with geological changes (slow), or don't cite sources. Practice: 'Could you watch this happen in your lifetime? No? Then it's probably a slow Earth event.'
- Chen gathered sources; which statement is supported by the information?
Answer: Glaciers move inches per day, shaping land slowly.
This question tests 2nd grade ability to gather information from sources about slow Earth events (NGSS 2-ESS1-1: Use information from several sources to provide evidence that Earth events can occur quickly or slowly). Earth events that happen slowly occur over years, decades, centuries, thousands of years, or even millions of years—time periods so long we cannot watch them happen. Slow Earth events include: mountains forming (rocks push up over millions of years), Grand Canyon forming (river cuts through rock over 5-6 million years), rock erosion by wind and water (shapes change over hundreds to thousands of years), glaciers moving (inches per day or feet per year, shaping land over thousands of years), soil forming (rock breaks down into soil over hundreds of years), stalactites growing in caves (one inch can take 100+ years), rock layers forming (sediment becomes rock over thousands of years), and coastlines changing (waves wear away land over decades and centuries). In this scenario, Chen's sources include information about glacier movement rates and their effects on landscapes over long time periods. Choice A is correct because it accurately describes glaciers moving inches per day and shaping land slowly, which matches scientific measurements showing glaciers typically move 1-30 inches daily, carving valleys over thousands of years through this persistent but extremely slow movement. Choice B represents a speed misconception, which happens when students imagine glaciers moving like avalanches or water rushing downhill, not understanding that glaciers are massive ice sheets that creep along incredibly slowly. To help students gather information about slow Earth events: Use comparisons like 'A glacier moves about as far in one day as the length of your foot—imagine how long it would take to travel across the playground at that speed!' and emphasize that even this tiny daily movement can carve deep valleys over thousands of years.
- Keisha watched a scientist interview: Dr. Patel measures glacier movement with stakes and GPS. Dr. Patel said the ice moves inches per day, shaping valleys over thousands of years. Based on the sources, how slow is glacier movement?
Answer: It moves inches per day and changes land over thousands of years
This question tests 2nd grade ability to gather information from sources about slow Earth events (NGSS 2-ESS1-1: Use information from several sources to provide evidence that Earth events can occur quickly or slowly). Earth events that happen slowly occur over years, decades, centuries, thousands of years, or even millions of years—time periods so long we cannot watch them happen. Slow Earth events include: mountains forming (rocks push up over millions of years), Grand Canyon forming (river cuts through rock over 5-6 million years), rock erosion by wind and water (shapes change over hundreds to thousands of years), glaciers moving (inches per day or feet per year, shaping land over thousands of years), soil forming (rock breaks down into soil over hundreds of years), stalactites growing in caves (one inch can take 100+ years), rock layers forming (sediment becomes rock over thousands of years), and coastlines changing (waves wear away land over decades and centuries). These events change Earth's surface so slowly that we can't see changes in a day, week, year, or even in our whole lifetime. We know about them through measurements showing tiny changes, photographs decades apart showing small differences, and rock evidence showing processes took millions of years. In this scenario, the sources include a scientist interview with Dr. Patel's measurements using stakes and GPS. The information shows glaciers move inches per day, shaping valleys over thousands of years. Choice A is correct because it accurately describes glacier movement as inches per day changing land over thousands of years, matching the interview and measurements. Choice B represents a common error of exaggerating speed, which happens when students confuse slow glacial movement with fast events like avalanches. To help students gather information about slow Earth events: Explicitly teach time scale contrasts: 'Fast events: seconds, minutes, hours, days—you can watch them happen. Slow events: years, hundreds of years, thousands of years, millions of years—too slow to watch, longer than many many lifetimes.' Use visual time scales: human lifetime (80 years), 100 years, 1,000 years, 1 million years, show where slow events fall. Practice with sources: 'This book says mountains take millions of years. This photo shows tiny change in 50 years. Both sources tell us this is slow.' Create 'Slow Earth Events' chart with columns for Event, How Slow (time), Source, Why We Know It's Slow. Use comparisons: 'Earthquake lasts 2 minutes. Mountains grow over 10 million years. Which is slow?' Emphasize 'too slow to see': 'Even if you watched a glacier your whole life, you wouldn't see much change.' Show photo pairs decades apart: 'Look—only small change in 50 years. That's very slow.' Watch for students who can't distinguish fast from slow time scales, mix weather changes (fast, seasonal) with geological changes (slow), or don't cite sources. Practice: 'Could you watch this happen in your lifetime? No? Then it's probably a slow Earth event.'
- Keisha used a book, article, and scientist; what did she learn?
Answer: Grand Canyon, soil, and glaciers change over long times
This question tests 2nd grade ability to gather information from sources about slow Earth events (NGSS 2-ESS1-1: Use information from several sources to provide evidence that Earth events can occur quickly or slowly). Earth events that happen slowly occur over years, decades, centuries, thousands of years, or even millions of years—time periods so long we cannot watch them happen. Slow Earth events include: mountains forming (rocks push up over millions of years), Grand Canyon forming (river cuts through rock over 5-6 million years), rock erosion by wind and water (shapes change over hundreds to thousands of years), glaciers moving (inches per day or feet per year, shaping land over thousands of years), soil forming (rock breaks down into soil over hundreds of years), stalactites growing in caves (one inch can take 100+ years), rock layers forming (sediment becomes rock over thousands of years), and coastlines changing (waves wear away land over decades and centuries). In this scenario, Keisha used multiple sources—a book, article, and scientist—to learn about various slow Earth events. The information shows that the Grand Canyon formed over millions of years, soil forms over hundreds of years, and glaciers move and shape land over thousands of years. Choice B is correct because it accurately summarizes that Grand Canyon, soil, and glaciers all change over long time periods, correctly identifying multiple slow Earth events from the sources. Choices A, C, and D represent misconceptions where students think all Earth changes happen fast, soil forms quickly in one week, glaciers stop moving, or mountains shrink quickly each hour, failing to understand the slow nature of these geological processes. To help students gather information about slow Earth events: Practice synthesizing information from multiple sources: 'The book says Grand Canyon took millions of years. The article says soil takes hundreds of years. The scientist says glaciers move for thousands of years. What do all these have in common? They're all very slow!'
- Based on the sources, which Earth events take a very long time?
Answer: Mountains rise over millions of years, very slowly.
This question tests 2nd grade ability to gather information from sources about slow Earth events (NGSS 2-ESS1-1: Use information from several sources to provide evidence that Earth events can occur quickly or slowly). Earth events that happen slowly occur over years, decades, centuries, thousands of years, or even millions of years—time periods so long we cannot watch them happen. Slow Earth events include: mountains forming (rocks push up over millions of years), Grand Canyon forming (river cuts through rock over 5-6 million years), rock erosion by wind and water (shapes change over hundreds to thousands of years), glaciers moving (inches per day or feet per year, shaping land over thousands of years), soil forming (rock breaks down into soil over hundreds of years), stalactites growing in caves (one inch can take 100+ years), rock layers forming (sediment becomes rock over thousands of years), and coastlines changing (waves wear away land over decades and centuries). In this scenario, the sources include information about various Earth events and their time scales, showing which events happen quickly versus slowly. Choice B is correct because it accurately identifies that mountains rise over millions of years very slowly, which matches scientific evidence from geology books and research showing mountain formation takes millions of years as tectonic plates push rock layers upward. Choice A represents a fast event misconception, which happens when students confuse earthquakes (which last seconds to minutes) with slow geological processes—earthquakes are sudden releases of energy, not slow changes. To help students gather information about slow Earth events: Explicitly teach time scale contrasts: 'Fast events: seconds, minutes, hours, days—you can watch them happen. Slow events: years, hundreds of years, thousands of years, millions of years—too slow to watch, longer than many many lifetimes.'
- Maya used sources; what evidence shows soil forms very slowly?
Answer: Scientists say one inch can take 500 years.
This question tests 2nd grade ability to gather information from sources about slow Earth events (NGSS 2-ESS1-1: Use information from several sources to provide evidence that Earth events can occur quickly or slowly). Earth events that happen slowly occur over years, decades, centuries, thousands of years, or even millions of years—time periods so long we cannot watch them happen. Slow Earth events include: mountains forming (rocks push up over millions of years), Grand Canyon forming (river cuts through rock over 5-6 million years), rock erosion by wind and water (shapes change over hundreds to thousands of years), glaciers moving (inches per day or feet per year, shaping land over thousands of years), soil forming (rock breaks down into soil over hundreds of years), stalactites growing in caves (one inch can take 100+ years), rock layers forming (sediment becomes rock over thousands of years), and coastlines changing (waves wear away land over decades and centuries). In this scenario, Maya's sources include scientific information about soil formation rates, showing that soil forms extremely slowly as rocks break down through weathering over centuries. Choice A is correct because it provides specific evidence from scientists stating that one inch of soil can take 500 years to form, which accurately represents the slow pace of soil formation through rock weathering and organic matter accumulation. Choice B represents a fast event misconception, which happens when students confuse floods (which deposit sediment quickly) with the slow process of turning rock into actual soil through chemical and physical weathering over hundreds of years. To help students gather information about slow Earth events: Use visual time scales showing human lifetime (80 years), 100 years, 1,000 years to illustrate how soil formation extends far beyond what we can observe, and practice citing specific evidence from sources like 'The scientist's data shows one inch takes 500 years—that's much longer than many lifetimes!'
- According to Sofia's information, what is true about the Grand Canyon forming?
Answer: The river cut it slowly over about 5–6 million years
This question tests 2nd grade ability to gather information from sources about slow Earth events (NGSS 2-ESS1-1: Use information from several sources to provide evidence that Earth events can occur quickly or slowly). Earth events that happen slowly occur over years, decades, centuries, thousands of years, or even millions of years—time periods so long we cannot watch them happen. Slow Earth events include: mountains forming (rocks push up over millions of years), Grand Canyon forming (river cuts through rock over 5-6 million years), rock erosion by wind and water (shapes change over hundreds to thousands of years), glaciers moving (inches per day or feet per year, shaping land over thousands of years), soil forming (rock breaks down into soil over hundreds of years), stalactites growing in caves (one inch can take 100+ years), rock layers forming (sediment becomes rock over thousands of years), and coastlines changing (waves wear away land over decades and centuries). These events change Earth's surface so slowly that we can't see changes in a day, week, year, or even in our whole lifetime. We know about them through measurements showing tiny changes, photographs decades apart showing small differences, and rock evidence showing processes took millions of years. In this scenario, the sources include a science book, photo comparisons, and a scientist explanation. The information shows the Grand Canyon formed over 5-6 million years, mountains form over millions of years, and erosion happens over hundreds of years. Choice A is correct because it accurately describes the Grand Canyon forming slowly using information from sources—it states the river cut it slowly over about 5–6 million years, which is supported by the science book and scientist explanation. Choice B represents a specific error type, which happens when students include fast events like a single storm carving it in one day, which contradicts the slow time scales in sources. To help students gather information about slow Earth events: Explicitly teach time scale contrasts: 'Fast events: seconds, minutes, hours, days—you can watch them happen. Slow events: years, hundreds of years, thousands of years, millions of years—too slow to watch, longer than many many lifetimes.' Use visual time scales: human lifetime (80 years), 100 years, 1,000 years, 1 million years, show where slow events fall. Practice with sources: 'This book says mountains take millions of years. This photo shows tiny change in 50 years. Both sources tell us this is slow.' Create 'Slow Earth Events' chart with columns for Event, How Slow (time), Source, Why We Know It's Slow. Use comparisons: 'Earthquake lasts 2 minutes. Mountains grow over 10 million years. Which is slow?' Emphasize 'too slow to see': 'Even if you watched a glacier your whole life, you wouldn't see much change.' Show photo pairs decades apart: 'Look—only small change in 50 years. That's very slow.' Watch for students who can't distinguish fast from slow time scales, mix weather changes (fast, seasonal) with geological changes (slow), or don't cite sources. Practice: 'Could you watch this happen in your lifetime? No? Then it's probably a slow Earth event.'
- Maya used sources: a book says mountains form over millions of years; photos from 1920 and 2020 show a cliff slowly eroding; Dr. Lee measured a glacier moving feet per year. Based on the sources, which events take a very long time?
Answer: Mountains rise, cliffs erode, glaciers move slowly for years
This question tests 2nd grade ability to gather information from sources about slow Earth events (NGSS 2-ESS1-1: Use information from several sources to provide evidence that Earth events can occur quickly or slowly). Earth events that happen slowly occur over years, decades, centuries, thousands of years, or even millions of years—time periods so long we cannot watch them happen. Slow Earth events include: mountains forming (rocks push up over millions of years), Grand Canyon forming (river cuts through rock over 5-6 million years), rock erosion by wind and water (shapes change over hundreds to thousands of years), glaciers moving (inches per day or feet per year, shaping land over thousands of years), soil forming (rock breaks down into soil over hundreds of years), stalactites growing in caves (one inch can take 100+ years), rock layers forming (sediment becomes rock over thousands of years), and coastlines changing (waves wear away land over decades and centuries). These events change Earth's surface so slowly that we can't see changes in a day, week, year, or even in our whole lifetime. We know about them through measurements showing tiny changes, photographs decades apart showing small differences, and rock evidence showing processes took millions of years. In this scenario, the sources include a book, photos from 1920 and 2020, and Dr. Lee's measurements. The information shows mountains form over millions of years, cliffs erode slowly over decades, and glaciers move feet per year. Choice A is correct because it accurately identifies slow Earth events like mountains rising, cliffs eroding, and glaciers moving over years, which is supported by the book, photos, and measurements. Choice B represents a common error of including fast events, which happens when students confuse quick changes like earthquakes with slow processes like mountain formation. To help students gather information about slow Earth events: Explicitly teach time scale contrasts: 'Fast events: seconds, minutes, hours, days—you can watch them happen. Slow events: years, hundreds of years, thousands of years, millions of years—too slow to watch, longer than many many lifetimes.' Use visual time scales: human lifetime (80 years), 100 years, 1,000 years, 1 million years, show where slow events fall. Practice with sources: 'This book says mountains take millions of years. This photo shows tiny change in 50 years. Both sources tell us this is slow.' Create 'Slow Earth Events' chart with columns for Event, How Slow (time), Source, Why We Know It's Slow. Use comparisons: 'Earthquake lasts 2 minutes. Mountains grow over 10 million years. Which is slow?' Emphasize 'too slow to see': 'Even if you watched a glacier your whole life, you wouldn't see much change.' Show photo pairs decades apart: 'Look—only small change in 50 years. That's very slow.' Watch for students who can't distinguish fast from slow time scales, mix weather changes (fast, seasonal) with geological changes (slow), or don't cite sources. Practice: 'Could you watch this happen in your lifetime? No? Then it's probably a slow Earth event.'
- Maya read a book and article; what do they show about erosion?
Answer: Wind and water wear rocks over thousands of years
This question tests 2nd grade ability to gather information from sources about slow Earth events (NGSS 2-ESS1-1: Use information from several sources to provide evidence that Earth events can occur quickly or slowly). Earth events that happen slowly occur over years, decades, centuries, thousands of years, or even millions of years—time periods so long we cannot watch them happen. Slow Earth events include: mountains forming (rocks push up over millions of years), Grand Canyon forming (river cuts through rock over 5-6 million years), rock erosion by wind and water (shapes change over hundreds to thousands of years), glaciers moving (inches per day or feet per year, shaping land over thousands of years), soil forming (rock breaks down into soil over hundreds of years), stalactites growing in caves (one inch can take 100+ years), rock layers forming (sediment becomes rock over thousands of years), and coastlines changing (waves wear away land over decades and centuries). In this scenario, Maya read a book and article that provide information about erosion—how wind and water slowly wear away rocks and change their shapes. The information shows that erosion happens over thousands of years as tiny particles are removed bit by bit. Choice A is correct because it accurately states that wind and water wear rocks over thousands of years, which correctly identifies erosion as a slow Earth event with an appropriate time scale that matches scientific understanding. Choices B, C, and D represent misconceptions where students think erosion happens quickly (in seconds during thunder), only in specific places (inside volcanoes), or stops after a short time (one year), failing to understand that erosion is a continuous, slow process. To help students gather information about slow Earth events: Use comparisons: 'Thunder lasts seconds. Erosion takes thousands of years. Which is slow?' Show photo pairs decades apart: 'Look—the rock changed shape just a little in 50 years. Erosion is very slow.'
- According to the sources, what is true about Grand Canyon forming?
Answer: The river cut rock over 5-6 million years
This question tests 2nd grade ability to gather information from sources about slow Earth events (NGSS 2-ESS1-1: Use information from several sources to provide evidence that Earth events can occur quickly or slowly). Earth events that happen slowly occur over years, decades, centuries, thousands of years, or even millions of years—time periods so long we cannot watch them happen. Slow Earth events include: mountains forming (rocks push up over millions of years), Grand Canyon forming (river cuts through rock over 5-6 million years), rock erosion by wind and water (shapes change over hundreds to thousands of years), glaciers moving (inches per day or feet per year, shaping land over thousands of years), soil forming (rock breaks down into soil over hundreds of years), stalactites growing in caves (one inch can take 100+ years), rock layers forming (sediment becomes rock over thousands of years), and coastlines changing (waves wear away land over decades and centuries). In this scenario, the sources provide information about how the Grand Canyon formed through the Colorado River slowly cutting through rock layers. The information shows that this massive canyon took 5-6 million years to form as the river gradually eroded the rock. Choice C is correct because it accurately describes the Grand Canyon forming over 5-6 million years as the river slowly cut through rock, which matches scientific evidence and correctly identifies this as an extremely slow Earth event. Choices A, B, and D represent misconceptions where students think the Grand Canyon formed quickly (in one week by flood, in days by wind, or overnight from cooling lava), failing to understand that canyon formation through river erosion is one of the slowest geological processes. To help students gather information about slow Earth events: Create 'Slow Earth Events' chart with columns for Event, How Slow (time), Source, Why We Know It's Slow. Emphasize 'too slow to see': 'The Grand Canyon took 5-6 million years. Even if you watched for 100 lifetimes, you wouldn't see much change.'
- Sofia read a science book: soil forms very slowly; it can take 500 years to make one inch. A scientist interview said rocks break into tiny pieces over many years. Based on the sources, what evidence shows soil forms slowly?
Answer: One inch of soil can take about 500 years
This question tests 2nd grade ability to gather information from sources about slow Earth events (NGSS 2-ESS1-1: Use information from several sources to provide evidence that Earth events can occur quickly or slowly). Earth events that happen slowly occur over years, decades, centuries, thousands of years, or even millions of years—time periods so long we cannot watch them happen. Slow Earth events include: mountains forming (rocks push up over millions of years), Grand Canyon forming (river cuts through rock over 5-6 million years), rock erosion by wind and water (shapes change over hundreds to thousands of years), glaciers moving (inches per day or feet per year, shaping land over thousands of years), soil forming (rock breaks down into soil over hundreds of years), stalactites growing in caves (one inch can take 100+ years), rock layers forming (sediment becomes rock over thousands of years), and coastlines changing (waves wear away land over decades and centuries). These events change Earth's surface so slowly that we can't see changes in a day, week, year, or even in our whole lifetime. We know about them through measurements showing tiny changes, photographs decades apart showing small differences, and rock evidence showing processes took millions of years. In this scenario, the sources include a science book and a scientist interview. The information shows soil forms very slowly, taking 500 years for one inch, as rocks break down over many years. Choice A is correct because it correctly states that one inch of soil can take about 500 years, which is supported by the science book and scientist interview. Choice B represents a common error of confusing fast weather events with slow processes, which happens when students think rainstorms create soil instantly instead of over centuries. To help students gather information about slow Earth events: Explicitly teach time scale contrasts: 'Fast events: seconds, minutes, hours, days—you can watch them happen. Slow events: years, hundreds of years, thousands of years, millions of years—too slow to watch, longer than many many lifetimes.' Use visual time scales: human lifetime (80 years), 100 years, 1,000 years, 1 million years, show where slow events fall. Practice with sources: 'This book says mountains take millions of years. This photo shows tiny change in 50 years. Both sources tell us this is slow.' Create 'Slow Earth Events' chart with columns for Event, How Slow (time), Source, Why We Know It's Slow. Use comparisons: 'Earthquake lasts 2 minutes. Mountains grow over 10 million years. Which is slow?' Emphasize 'too slow to see': 'Even if you watched a glacier your whole life, you wouldn't see much change.' Show photo pairs decades apart: 'Look—only small change in 50 years. That's very slow.' Watch for students who can't distinguish fast from slow time scales, mix weather changes (fast, seasonal) with geological changes (slow), or don't cite sources. Practice: 'Could you watch this happen in your lifetime? No? Then it's probably a slow Earth event.'
- Chen gathered sources; which statement is supported about glaciers moving?
Answer: Glaciers move inches per day, shaping land for thousands
This question tests 2nd grade ability to gather information from sources about slow Earth events (NGSS 2-ESS1-1: Use information from several sources to provide evidence that Earth events can occur quickly or slowly). Earth events that happen slowly occur over years, decades, centuries, thousands of years, or even millions of years—time periods so long we cannot watch them happen. Slow Earth events include: mountains forming (rocks push up over millions of years), Grand Canyon forming (river cuts through rock over 5-6 million years), rock erosion by wind and water (shapes change over hundreds to thousands of years), glaciers moving (inches per day or feet per year, shaping land over thousands of years), soil forming (rock breaks down into soil over hundreds of years), stalactites growing in caves (one inch can take 100+ years), rock layers forming (sediment becomes rock over thousands of years), and coastlines changing (waves wear away land over decades and centuries). In this scenario, Chen gathered sources including measurements, books, and articles about glacier movement. The information shows that glaciers move extremely slowly—just inches per day—but over thousands of years, this slow movement shapes the land by carving valleys and moving rocks. Choice C is correct because it accurately describes glaciers moving inches per day and shaping land over thousands of years, which correctly identifies glacier movement as a slow Earth event with appropriate time and distance scales. Choices A, B, and D represent misconceptions where students think glaciers move quickly (miles in one minute), change rapidly (melt and grow in one day), or confuse what glaciers are made of (sand instead of ice), failing to understand the extremely slow nature of glacier movement. To help students gather information about slow Earth events: Practice with sources: 'The measurements show glaciers move inches per day. That's slower than you walk! But over thousands of years, those inches add up to miles.'
- Chen used a book and museum; which slow change matches both sources?
Answer: Soil can take 500 years for one inch.
This question tests 2nd grade ability to gather information from sources about slow Earth events (NGSS 2-ESS1-1: Use information from several sources to provide evidence that Earth events can occur quickly or slowly). Earth events that happen slowly occur over years, decades, centuries, thousands of years, or even millions of years—time periods so long we cannot watch them happen. Slow Earth events include: mountains forming (rocks push up over millions of years), Grand Canyon forming (river cuts through rock over 5-6 million years), rock erosion by wind and water (shapes change over hundreds to thousands of years), glaciers moving (inches per day or feet per year, shaping land over thousands of years), soil forming (rock breaks down into soil over hundreds of years), stalactites growing in caves (one inch can take 100+ years), rock layers forming (sediment becomes rock over thousands of years), and coastlines changing (waves wear away land over decades and centuries). In this scenario, Chen used a book and museum as sources to learn about soil formation. Choice A is correct because it states that soil can take 500 years to form just one inch, which accurately represents the extremely slow process of rock weathering and decomposition that creates soil—both a science book and museum exhibit would provide this consistent information about slow soil formation. Choices B, C, and D represent misconceptions where students think soil forms quickly (in minutes, overnight, or during a thunderclap), not understanding that soil formation requires centuries of slow chemical and physical weathering of rock combined with organic matter decomposition. To help students gather information about slow Earth events: Create 'Slow Earth Events' chart with columns for Event, How Slow (time), Source, Why We Know It's Slow, and help students see that multiple sources agree on these time scales.
- Amir read a book: wind and water wear down rocks over thousands of years. He compared photos of the same desert rock from 1970 and 2020 and saw small rounding. Based on the sources, what do the photos show about erosion?
Answer: Erosion is gradual, with small changes across many decades
This question tests 2nd grade ability to gather information from sources about slow Earth events (NGSS 2-ESS1-1: Use information from several sources to provide evidence that Earth events can occur quickly or slowly). Earth events that happen slowly occur over years, decades, centuries, thousands of years, or even millions of years—time periods so long we cannot watch them happen. Slow Earth events include: mountains forming (rocks push up over millions of years), Grand Canyon forming (river cuts through rock over 5-6 million years), rock erosion by wind and water (shapes change over hundreds to thousands of years), glaciers moving (inches per day or feet per year, shaping land over thousands of years), soil forming (rock breaks down into soil over hundreds of years), stalactites growing in caves (one inch can take 100+ years), rock layers forming (sediment becomes rock over thousands of years), and coastlines changing (waves wear away land over decades and centuries). These events change Earth's surface so slowly that we can't see changes in a day, week, year, or even in our whole lifetime. We know about them through measurements showing tiny changes, photographs decades apart showing small differences, and rock evidence showing processes took millions of years. In this scenario, the sources include a book and photos of a desert rock from 1970 and 2020. The information shows wind and water wear down rocks over thousands of years, with photos revealing small rounding over 50 years. Choice A is correct because it correctly describes erosion as gradual with small changes across many decades, supported by the book and photo comparisons. Choice D represents a common error of misunderstanding process duration, which happens when students think erosion completes quickly once it starts instead of over long periods. To help students gather information about slow Earth events: Explicitly teach time scale contrasts: 'Fast events: seconds, minutes, hours, days—you can watch them happen. Slow events: years, hundreds of years, thousands of years, millions of years—too slow to watch, longer than many many lifetimes.' Use visual time scales: human lifetime (80 years), 100 years, 1,000 years, 1 million years, show where slow events fall. Practice with sources: 'This book says mountains take millions of years. This photo shows tiny change in 50 years. Both sources tell us this is slow.' Create 'Slow Earth Events' chart with columns for Event, How Slow (time), Source, Why We Know It's Slow. Use comparisons: 'Earthquake lasts 2 minutes. Mountains grow over 10 million years. Which is slow?' Emphasize 'too slow to see': 'Even if you watched a glacier your whole life, you wouldn't see much change.' Show photo pairs decades apart: 'Look—only small change in 50 years. That's very slow.' Watch for students who can't distinguish fast from slow time scales, mix weather changes (fast, seasonal) with geological changes (slow), or don't cite sources. Practice: 'Could you watch this happen in your lifetime? No? Then it's probably a slow Earth event.'
- Yuki read an article: waves can slowly wear away a coastline over decades and centuries. Photos from 1950 and 2020 show a cliff line moved back a little. Based on the sources, what evidence shows coastline change is slow?
Answer: Two photos 70 years apart show only a small cliff change
This question tests 2nd grade ability to gather information from sources about slow Earth events (NGSS 2-ESS1-1: Use information from several sources to provide evidence that Earth events can occur quickly or slowly). Earth events that happen slowly occur over years, decades, centuries, thousands of years, or even millions of years—time periods so long we cannot watch them happen. Slow Earth events include: mountains forming (rocks push up over millions of years), Grand Canyon forming (river cuts through rock over 5-6 million years), rock erosion by wind and water (shapes change over hundreds to thousands of years), glaciers moving (inches per day or feet per year, shaping land over thousands of years), soil forming (rock breaks down into soil over hundreds of years), stalactites growing in caves (one inch can take 100+ years), rock layers forming (sediment becomes rock over thousands of years), and coastlines changing (waves wear away land over decades and centuries). These events change Earth's surface so slowly that we can't see changes in a day, week, year, or even in our whole lifetime. We know about them through measurements showing tiny changes, photographs decades apart showing small differences, and rock evidence showing processes took millions of years. In this scenario, the sources include an article and photos from 1950 and 2020. The information shows waves wear away coastlines over decades and centuries, with photos showing the cliff line moved back a little over 70 years. Choice A is correct because it accurately identifies evidence of slow change with two photos 70 years apart showing only a small cliff change, matching the article and photos. Choice B represents a common error of incorrect speed, which happens when students overestimate the rate of change, thinking it happens hourly instead of over long periods. To help students gather information about slow Earth events: Explicitly teach time scale contrasts: 'Fast events: seconds, minutes, hours, days—you can watch them happen. Slow events: years, hundreds of years, thousands of years, millions of years—too slow to watch, longer than many many lifetimes.' Use visual time scales: human lifetime (80 years), 100 years, 1,000 years, 1 million years, show where slow events fall. Practice with sources: 'This book says mountains take millions of years. This photo shows tiny change in 50 years. Both sources tell us this is slow.' Create 'Slow Earth Events' chart with columns for Event, How Slow (time), Source, Why We Know It's Slow. Use comparisons: 'Earthquake lasts 2 minutes. Mountains grow over 10 million years. Which is slow?' Emphasize 'too slow to see': 'Even if you watched a glacier your whole life, you wouldn't see much change.' Show photo pairs decades apart: 'Look—only small change in 50 years. That's very slow.' Watch for students who can't distinguish fast from slow time scales, mix weather changes (fast, seasonal) with geological changes (slow), or don't cite sources. Practice: 'Could you watch this happen in your lifetime? No? Then it's probably a slow Earth event.'
- Sofia used sources; what evidence shows stalactites grow slowly in caves?
Answer: The museum says one inch can take 100+ years
This question tests 2nd grade ability to gather information from sources about slow Earth events (NGSS 2-ESS1-1: Use information from several sources to provide evidence that Earth events can occur quickly or slowly). Earth events that happen slowly occur over years, decades, centuries, thousands of years, or even millions of years—time periods so long we cannot watch them happen. Slow Earth events include: mountains forming (rocks push up over millions of years), Grand Canyon forming (river cuts through rock over 5-6 million years), rock erosion by wind and water (shapes change over hundreds to thousands of years), glaciers moving (inches per day or feet per year, shaping land over thousands of years), soil forming (rock breaks down into soil over hundreds of years), stalactites growing in caves (one inch can take 100+ years), rock layers forming (sediment becomes rock over thousands of years), and coastlines changing (waves wear away land over decades and centuries). In this scenario, Sofia used sources including a museum exhibit, an article, and a scientist's explanation about stalactite formation in caves. The information shows that stalactites grow incredibly slowly as mineral-rich water drips and leaves tiny deposits, with one inch taking 100+ years to form. Choice A is correct because it accurately cites evidence from the museum stating that one inch of stalactite can take 100+ years to grow, which correctly identifies stalactite formation as a slow Earth event with an appropriate time scale. Choices B, C, and D represent misconceptions where students think stalactites grow quickly (one foot each hour), caves form instantly, or stalactites are made by earthquakes, failing to understand the extremely slow process of mineral deposition. To help students gather information about slow Earth events: Emphasize 'too slow to see': 'Even if you visited the same cave every year of your life, you probably wouldn't see the stalactite grow at all—it's that slow!'
- Based on Chen's sources, which statement about soil formation is supported?
Answer: One inch of soil can take 500+ years to form
This question tests 2nd grade ability to gather information from sources about slow Earth events (NGSS 2-ESS1-1: Use information from several sources to provide evidence that Earth events can occur quickly or slowly). Earth events that happen slowly occur over years, decades, centuries, thousands of years, or even millions of years—time periods so long we cannot watch them happen. Slow Earth events include: mountains forming (rocks push up over millions of years), Grand Canyon forming (river cuts through rock over 5-6 million years), rock erosion by wind and water (shapes change over hundreds to thousands of years), glaciers moving (inches per day or feet per year, shaping land over thousands of years), soil forming (rock breaks down into soil over hundreds of years), stalactites growing in caves (one inch can take 100+ years), rock layers forming (sediment becomes rock over thousands of years), and coastlines changing (waves wear away land over decades and centuries). These events change Earth's surface so slowly that we can't see changes in a day, week, year, or even in our whole lifetime. We know about them through measurements showing tiny changes, photographs decades apart showing small differences, and rock evidence showing processes took millions of years. In this scenario, the sources include a museum exhibit, article, and measurement data. The information shows soil forms over 500+ years, erosion over hundreds of years, and rock layers over thousands of years. Choice A is correct because it accurately identifies soil formation as slow using information from sources—it states one inch of soil can take 500+ years to form, which matches the article and measurement data. Choice B represents a specific error type, which happens when students claim fast formation like in one hour after rain, ignoring the slow time scales in sources. To help students gather information about slow Earth events: Explicitly teach time scale contrasts: 'Fast events: seconds, minutes, hours, days—you can watch them happen. Slow events: years, hundreds of years, thousands of years, millions of years—too slow to watch, longer than many many lifetimes.' Use visual time scales: human lifetime (80 years), 100 years, 1,000 years, 1 million years, show where slow events fall. Practice with sources: 'This book says mountains take millions of years. This photo shows tiny change in 50 years. Both sources tell us this is slow.' Create 'Slow Earth Events' chart with columns for Event, How Slow (time), Source, Why We Know It's Slow. Use comparisons: 'Earthquake lasts 2 minutes. Mountains grow over 10 million years. Which is slow?' Emphasize 'too slow to see': 'Even if you watched a glacier your whole life, you wouldn't see much change.' Show photo pairs decades apart: 'Look—only small change in 50 years. That's very slow.' Watch for students who can't distinguish fast from slow time scales, mix weather changes (fast, seasonal) with geological changes (slow), or don't cite sources. Practice: 'Could you watch this happen in your lifetime? No? Then it's probably a slow Earth event.'
- Keisha used sources; what do they show about slow Earth events?
Answer: Slow changes take a very long time, many years.
This question tests 2nd grade ability to gather information from sources about slow Earth events (NGSS 2-ESS1-1: Use information from several sources to provide evidence that Earth events can occur quickly or slowly). Earth events that happen slowly occur over years, decades, centuries, thousands of years, or even millions of years—time periods so long we cannot watch them happen. Slow Earth events include: mountains forming (rocks push up over millions of years), Grand Canyon forming (river cuts through rock over 5-6 million years), rock erosion by wind and water (shapes change over hundreds to thousands of years), glaciers moving (inches per day or feet per year, shaping land over thousands of years), soil forming (rock breaks down into soil over hundreds of years), stalactites growing in caves (one inch can take 100+ years), rock layers forming (sediment becomes rock over thousands of years), and coastlines changing (waves wear away land over decades and centuries). In this scenario, Keisha's sources include general information about the characteristics and time scales of slow Earth events, helping her understand what makes an event 'slow.' Choice B is correct because it accurately summarizes that slow changes take a very long time spanning many years, which is the defining characteristic of slow Earth events—they occur over time periods much longer than human observation spans. Choice A represents an opposite understanding error, which happens when students confuse the meaning of 'slow' and think slow events are somehow visible like watching a snail move, not understanding that geological 'slow' means too slow for any human to observe. To help students gather information about slow Earth events: Emphasize the key concept: 'Slow Earth events take so long that even your great-great-grandparents couldn't have seen them finish happening. They take many, many lifetimes!'
- Jamal read sources; how slow is mountain forming over time?
Answer: Mountains rise over millions of years, too slow to watch.
This question tests 2nd grade ability to gather information from sources about slow Earth events (NGSS 2-ESS1-1: Use information from several sources to provide evidence that Earth events can occur quickly or slowly). Earth events that happen slowly occur over years, decades, centuries, thousands of years, or even millions of years—time periods so long we cannot watch them happen. Slow Earth events include: mountains forming (rocks push up over millions of years), Grand Canyon forming (river cuts through rock over 5-6 million years), rock erosion by wind and water (shapes change over hundreds to thousands of years), glaciers moving (inches per day or feet per year, shaping land over thousands of years), soil forming (rock breaks down into soil over hundreds of years), stalactites growing in caves (one inch can take 100+ years), rock layers forming (sediment becomes rock over thousands of years), and coastlines changing (waves wear away land over decades and centuries). In this scenario, Jamal's sources include geological information about mountain formation time scales, showing the extremely slow process of tectonic uplift. Choice C is correct because it accurately describes mountains rising over millions of years too slowly to watch, which matches scientific evidence showing mountain ranges like the Himalayas have been growing for 50 million years at rates of only millimeters per year. Choice A represents a weather confusion misconception, which happens when students mix up fast weather events (like rain) with slow geological processes, thinking mountains could grow quickly like plants after rain. To help students gather information about slow Earth events: Create a 'Too Slow to See' chart showing that if mountains grow 1 millimeter per year, in your whole lifetime (80 years) they'd only grow 8 centimeters—less than the length of a crayon—which is why we say it's too slow to watch.
- Based on the sources, how slow is mountain building over time?
Answer: Mountains form over millions of years as rocks push up
This question tests 2nd grade ability to gather information from sources about slow Earth events (NGSS 2-ESS1-1: Use information from several sources to provide evidence that Earth events can occur quickly or slowly). Earth events that happen slowly occur over years, decades, centuries, thousands of years, or even millions of years—time periods so long we cannot watch them happen. Slow Earth events include: mountains forming (rocks push up over millions of years), Grand Canyon forming (river cuts through rock over 5-6 million years), rock erosion by wind and water (shapes change over hundreds to thousands of years), glaciers moving (inches per day or feet per year, shaping land over thousands of years), soil forming (rock breaks down into soil over hundreds of years), stalactites growing in caves (one inch can take 100+ years), rock layers forming (sediment becomes rock over thousands of years), and coastlines changing (waves wear away land over decades and centuries). In this scenario, the sources provide information about mountain building, one of the slowest Earth processes. The information shows that mountains form over millions of years as tectonic forces slowly push rock layers upward. Choice B is correct because it accurately states that mountains form over millions of years as rocks push up, which correctly identifies mountain building as an extremely slow Earth event with the appropriate geological time scale. Choices A, C, and D represent misconceptions where students think mountains form quickly (in one day after rain, in minutes when rivers freeze, or only when lightning hits), failing to understand that mountain building is one of the slowest geological processes on Earth. To help students gather information about slow Earth events: Use visual time scales showing where mountain building (millions of years) falls compared to a human lifetime. Create comparisons: 'Your whole life is about 80 years. Mountains take 10 million years to form. That's more than 100,000 lifetimes!'
