2nd Grade Science : Use sources to show that some Earth events occur slowly

Study concepts, example questions & explanations for 2nd Grade Science

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Example Questions

Example Question #1 : Use Sources To Show That Some Earth Events Occur Slowly

One of the slowest events on Earth that can change the shape of the land is erosion.

What does the term erosion mean? Example: The erosion of the beach left many homes at risk for collapse. The sand is still sliding and moving closer to the ocean.

Possible Answers:

Something beautiful and unique

Wearing away or moving weathered materials

A large tropical storm

Breaking down of plants

Correct answer:

Wearing away or moving weathered materials

Explanation:

Erosion is an event that happens daily on Earth, but it happens very slowly. Erosion is the movement of the broken down materials from weathering. The dirt, plant matter, rocks, and other materials are moved to a new location, and new landforms are created while others are destroyed or changed.

Example Question #2 : Use Sources To Show That Some Earth Events Occur Slowly

The Grand Canyon is one of the United State’s best examples of erosion. Wind, rain, and the Colorado River slowly created it. These forces cut and shaped the area into what it is today. The Appalachian Mountains were a towering mountain range millions of years ago. Today their highest point is 6,684 feet tall. That same peak used to be an estimated 20,000 feet high. Erosion over time has worn the mountains down and changed them forever.

Which keywords or phrases from this text show that these events happened slowly?

Possible Answers:

"slowly," "were a towering mountain range millions of years ago," "erosion over time," and "used to be"

"Colorado River slowly," "towering mountain range," "highest point is 6,684 feet tall," and "20,000 feet high."

"one of the United State’s best examples," "cut and shaped the area," and "The Appalachian Mountains"

"The Grand Canyon is one of the United State’s best examples of erosion."

Correct answer:

"slowly," "were a towering mountain range millions of years ago," "erosion over time," and "used to be"

Explanation:

Erosion is an extremely slow process, but the results are extraordinary. The clues in the text that let readers know this is a slow-moving process is "slowly," "were a towering mountain range millions of years ago," "erosion over time," and "used to be." These words and phrases all hint to something taking a long time to happen. Some processes on earth happen quickly, but not erosion!

Example Question #1 : Use Sources To Show That Some Earth Events Occur Slowly

Which photo shows an Earth event that happens slowly (in months or years)?

Possible Answers:

Cyprus, Coast, Cliff, Cavo Greko

Key West, Florida, Hurricane Dennis

Wildfire, Forest, Fire, Blaze, Smoke

Lightning Bolt, Lightning, Power, Storm

Correct answer:

Cyprus, Coast, Cliff, Cavo Greko

Explanation:

The photo that shows a slowly occurring Earth event would be the cliffsides of a beach. These have been worn away over many years (millions) as the dirt, sand, and rocks eroded. Lightning strikes, tropical storms, and wildfires are all quickly occurring events.

Example Question #1 : Use Sources To Show That Some Earth Events Occur Slowly

Why is this photo an example of an event on Earth that happens slowly?

Creek, Canyon, Stream, Wilderness, Cliff

Possible Answers:

It is an example of weathering and erosion.

It is an example of a place people can visit and take photos.

It is from an earthquake that took place.

It is a very fast-moving river.

Correct answer:

It is an example of weathering and erosion.

Explanation:

The provided photo depicts a stream or river racing through a carved out section of a canyon. This process is called weathering and erosion and takes millions of years to happen. The river beating into the sides of the canyon breaks apart small pieces of rock and sand, and the water pushes it downstream. The results are a carved section with deposits of debris downstream.

Example Question #2 : Use Sources To Show That Some Earth Events Occur Slowly

What is the definition of weathering? Example: Weathering is an important factor in the creation of new landforms.

Possible Answers:

What the temperature and rain conditions are like outside

The process of predicting upcoming storms

The process of being worn down or broken

A type of mountain

Correct answer:

The process of being worn down or broken

Explanation:

Weathering is the process of breaking down or wearing down the Earth with wind or water. As rivers move through areas banks and canyons are formed. Wind and rain beat on the cliffsides and cause pieces to break away. These are examples of the slow-moving process of weathering.

Example Question #1 : Use Sources To Show That Some Earth Events Occur Slowly

The Grand Canyon is one of the United State’s best examples of erosion. Wind, rain, and the Colorado River slowly created it. These forces cut and shaped the area into what it is today. The Appalachian Mountains were a towering mountain range millions of years ago. Today their highest point is 6,684 feet tall. That same peak used to be an estimated 20,000 feet high. Erosion over time has worn the mountains down and changed them forever.

What conclusion can the reader make about the formation of mountains?

Possible Answers:

It doesn't happen.

It happens quickly.

No one knows how long it takes.

It happens slowly.

Correct answer:

It happens slowly.

Explanation:

Erosion is a prolonged process, but the results are extraordinary. The clues in the text that let readers know this is a slow-moving process is "slowly," "were a towering mountain range millions of years ago," "erosion over time," and "used to be." These words and phrases all hint to something taking a long time to happen. Some processes on Earth happen quickly, but not erosion!

Example Question #3 : Use Sources To Show That Some Earth Events Occur Slowly

California had two significant events that took place today that shook residents up. The first was a sudden wildfire that struck the forested area outside of Los Angeles and terrified residents! It didn't rage for very long before firefighters put it out. A flick of a match is all it takes to start a massive fire. There were no injuries or deaths, luckily. The other event was a slippery mess. Northern California had been experiencing heavy rains for days, and because of years of erosion to cliffsides and roads, a terrible mudslide began. It is still ongoing, and there is no real way to stop it, it has to run its course. Unfortunately, when land is broken down over time, it becomes more dangerous in the case of prolonged rainstorms.

What are the keywords/phrases in this text that allude to an event that happens slowly?

Possible Answers:

"terrible mudslide"

"slippery mess" and "mudslide"

"years of erosion" and "over time"

"sudden" and "heavy"

Correct answer:

"years of erosion" and "over time"

Explanation:

In the passage given, the event that happened slowly was the mudslide. Events on Earth can happen at different speeds. The wildfire is described as "sudden," "didn't rage for long," and "a flick of a match" can start them. This is all language that shows how quickly the fire started. The mudslide, on the other hand, is described as happening after "heavy rain for days," and that "years of erosion" led to the right conditions. The text also states that the mudslide is "still ongoing" and that "when land is broken down over time," conditions become more dangerous. This demonstrates an event that takes a long time or happens slowly.

 

Example Question #1 : Use Sources To Show That Some Earth Events Occur Slowly

Why is this photo an example of an event on Earth that happens slowly?

Cyprus, Coast, Cliff, Cavo Greko

Possible Answers:

Cliffsides can take days to form.

Cliffsides can take millions of years to form.

Cliffsides never change or are created.

Cliffsides can take weeks to form.

Correct answer:

Cliffsides can take millions of years to form.

Explanation:

Cliffsides are formed over thousands, if not millions of years of weathering and erosion. Waves, wind, rain, and possible vegetation and ice wear away the rock and break it over the years. Water and wind carry the broken pieces away to new places. This is a very slow-moving process.

Example Question #1 : Use Sources To Show That Some Earth Events Occur Slowly

Tsunamis are severe oceanic storms that cause extreme devastation. They are a series of waves that can be miles long, up to 100 feet high, and can travel at 400 miles per hour. They are caused by significant and sudden disturbances of the sea’s surface. Volcanic eruptions, landslides, earthquakes can trigger a tsunami. A massive wall of water will wash ashore, and there is very little time or warning for those who live in the communities nearby. The series of waves can last for hours, and massive flooding adds to the problem. If you find yourself in a tsunami, get to high ground, keep calm, do not drive, and follow instructions from local officials.
 
What words/phrases let readers know these are events that do NOT happen slowly?
Possible Answers:

"sudden" and "very little time or warning"

"massive flooding" and "disturbances"

"series of waves" and "warning"

"extreme devastation"

Correct answer:

"sudden" and "very little time or warning"

Explanation:

Volcanic eruptions, landslides, earthquakes, and tsunamis are all events that happen quickly. Events that occur slowly are weathering and erosion, creating new landforms. The keywords that let readers know this event does NOT occur slowly are "sudden" and "very little time or warning."

Example Question #1 : Use Sources To Show That Some Earth Events Occur Slowly

Erosion happens very slowly over time. It is the movement of broken rocks, dirt, and sediment caused by weathering. Which answer choice gives an example of erosion?

Possible Answers:

Ice freezing in a rock crevice

A river carrying broken rocks downstream

Plant roots growing into a hillside

Wind breaking a cliffside

Correct answer:

A river carrying broken rocks downstream

Explanation:

Erosion is the movement of broken materials, and only once answer choice mentions moving the pieces, "A river carrying broken rocks downstream." This example shows that water in the form of a river is moving the broken parts of the material. The other examples are weathering, which is the process of breaking the materials.

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