Use evidence to support an explanation about environmental...

SECTION 1

Why Do We Look for Clues?

Have you ever seen a puddle dry up? Or leaves fall off a tree?

People have always noticed that places change. That means things do not stay the same.

Long ago, people looked at the world around them. They asked, "Why did this place change?" They used their eyes and ears to find out!

Long Ago

Farmers Watch the Land

Farmers saw rain wash soil away. They looked for clues to keep soil safe.

Many Years Ago

People Study Weather

People noticed storms could change how a place looks. They drew pictures of what they saw.

Not Long Ago

Scientists Use Photos

Scientists took photos of the same place over time. Photos showed how places change!

Today

You Can Be a Scientist!

You can look for clues too! You can use what you see to explain changes.

So here is our big question: How can we use clues to explain why a place changed?

SECTION 2

Big Ideas About Change and Evidence

Let's learn some big ideas. These will help you think like a scientist!

Environment

Environment means the place where we live. That means the land, water, air, plants, and animals all around us.

Change

Change means something is different from before. A tree losing its leaves is a change!

Evidence

Evidence means clues that we can see, hear, or feel. That means proof that something happened.

Explanation

An explanation tells why something happened. That means we use our clues to tell a story about the change.

🔍 KEY TAKEAWAY

Think of yourself as a detective! A detective looks for clues to solve a mystery. You look for evidence to explain why a place changed. You are an Earth detective!

SECTION 3

A Playground Before and After a Storm

Let's look at our anchoring phenomenon! A big rainstorm came to a playground. Let's see what happened.

Look at the two pictures! On the left, the playground is neat. On the right, after the storm, there is mud, a broken branch, and sand spread around. These are evidence of change!

What clues do you see? The mud puddle tells us it rained. The broken branch tells us the wind was strong. We can use these clues as evidence to explain what happened!

SECTION 4

How Do We Use Evidence?

Scientists follow steps to use evidence. You can do this too! Here is how it works.

Three Steps to Be an Earth Detective

Step 1: Observe. That means look very carefully. Use your eyes! What do you see that is different?
Step 2: Find evidence. That means find clues. What tells you that a change happened?
Step 3: Explain. That means tell what happened and WHY. Use your clues to tell the story!

Follow the arrows! First you observe, then you find evidence, then you explain what happened.

This is what real scientists do! They look, they find clues, and then they explain. You can do it too!

SECTION 5

Different Kinds of Changes to Our Earth

Many things can change our environment. Let's look at some kinds of changes and the evidence they leave behind.

Kinds of Environmental Changes and Their Evidence

What Changed It?	What Do We See? (Evidence)	Our Explanation
🌧️ Rain	Puddles, mud, wet ground	Water fell from the sky.
💨 Wind	Leaves on the ground, broken branches	Strong wind blew things around.
🌞 Sun	Dry, cracked ground, dried-up puddles	The sun's heat dried the water.
🏗️ People	New buildings, cut-down trees, roads	People built something new.

Each kind of change leaves different clues. When we see mud and puddles, we know it rained. When we see dry, cracked ground, we know the sun was hot. The clues are our evidence!

🤔 Think About It!

Look outside your window. What evidence of change do you see? Maybe you see wet sidewalks or leaves on the ground. What do those clues tell you?

SECTION 6

Let's Solve One Together!

Let's practice being Earth detectives! Here is a story. A garden looked different this morning. Let's figure out what happened.

The Changed Garden

Step 1 — ObserveWe look at the garden. Yesterday, the flowers were standing tall. Today, the flowers are bent over. The ground is very wet. There are worms on top of the soil.

We see bent flowers, wet ground, and worms.

Step 2 — Find EvidenceWhat are our clues? The ground is wet. That is evidence! The flowers are bent. That is more evidence! The worms came up from the ground. That is also evidence!

Evidence: wet ground, bent flowers, worms on top.

Step 3 — ExplainNow we use our evidence to explain. The wet ground tells us water fell. The bent flowers tell us heavy rain pushed them. The worms came up because the ground was full of water. We can explain: it rained a lot last night!

Explanation: It rained a lot. The rain made the ground wet, pushed the flowers down, and brought worms up.

Great job! You used evidence to explain a change. That is what real scientists do every day!

SECTION 7

What Makes Good Evidence?

Not all guesses are the same. Good evidence helps us make the best explanation. Let's learn the difference!

Good Evidence vs. Just a Guess

Good Evidence 👍	Just a Guess 🤷
You can see it, touch it, or hear it.	You made it up without looking.
"The ground is wet, so it rained."	"Maybe a dragon cried on it."
Other people can see it too.	Only you can imagine it.
It matches what really happened.	It is a fun story but not real.

⭐ KEY TAKEAWAY

Good evidence is something you can really see or feel. It is like how you know it is cold outside because you can feel the cold air on your face. You do not just guess it is cold — you feel it! That feeling is your evidence.

SECTION 8

What Will You Learn Next?

You are already so good at using evidence! As you grow, you will learn even more about how Earth changes.

Your Learning Journey

What You Know Now 🌱	What You Will Learn Later 🌳
You can find evidence of changes.	You will learn how to measure changes with tools.
You know weather can change places.	You will learn about bigger weather events like floods.
You can explain changes you see.	You will learn to write longer reports with evidence.
You know people can change the land.	You will learn ways people can help protect the Earth.

You are building important skills right now. Every time you look closely and use clues, you are thinking like a scientist. Keep being curious!

SECTION 9

Practice Time!

Here is a new story! A class went to a park. When they came back a week later, the park looked different. Use your detective skills!

🏞️ The Park Story

The class visited the park last week. The pond was full of water. The trees had lots of green leaves. The path was smooth. Now, a week later, the pond is smaller. There are yellow and brown leaves on the ground. There are cracks in the dry path.

PROBLEM 1 — CONCEPTUAL

What does the word "evidence" mean? A) A made-up story B) Clues that you can see, hear, or feel C) Something you wish would happen

PROBLEM 2 — BASIC OBSERVATION

Look at the park story. What is one piece of evidence that the park changed? A) The children are happy. B) The pond has less water now. C) The park has a name.

PROBLEM 3 — INTERMEDIATE

The path in the park has cracks. What could explain the cracks? A) A giant stepped on it. B) It was very hot and dry with no rain. C) Someone painted the cracks.

PROBLEM 4 — APPLIED

The leaves on the ground are yellow and brown. The trees used to have green leaves. What does this evidence tell you? A) Someone pulled the leaves off. B) The season is changing from summer to fall. C) The trees are not real.

PROBLEM 5 — CRITICAL THINKING

Think and Share: Imagine you went back to the park after a big rainstorm. What evidence would you look for? What would it tell you? Tell a partner or draw a picture.

SUMMARY

What We Learned!

We learned that our environment can change. Rain, wind, sun, and people can all change a place. We can find evidence — that means clues — to figure out what happened. Good evidence is something we can really observe, like seeing mud or feeling wet ground.

We follow three steps: observe the change, find evidence, and then explain why it happened using our clues. You are an Earth detective! Keep looking for clues about how the world around you changes.