What's Happening? 🔍
🔍 ANCHORING PHENOMENON
Imagine you wake up on a cold winter morning. You look out your window and see ice covering a puddle outside. Later, the sun comes out and the ice melts. By afternoon, the puddle is getting smaller. Where did the water go?
Now think about a hot summer day. You see big, fluffy clouds in the sky. Then it starts to rain! The rain fills up puddles, streams, and lakes. Water seems to be everywhere — but it looks different in different places!
Big Ideas About Water 💧
Water is one of the most important things on Earth. People, animals, and plants all need water to live. But water does not stay in just one place. And it does not always look the same!
Let's learn about where water is found and the different forms it can take.
Water Is in Many Places
Water Has Different Forms
Water Changes Form
Let's Try It! 🔬
Materials You Need:
- A small cup of water
- A freezer
- A sunny window or warm spot
Steps:
- Pour water into the cup. Look at it. This is liquid water.
- Put the cup in the freezer. Wait a few hours. Take it out. Now it is ice — solid water!
- Set the cup by a sunny window. Watch what happens. The ice slowly melts back into liquid water.
- Leave the cup there for a whole day. Is there less water now? Some of it turned into water vapor and went into the air!
What to notice: Water can change from liquid to solid and back again. It can also seem to disappear into the air!
What We Discovered 🌊
When we do the cup experiment, we can see water change. The liquid water becomes solid ice in the freezer. The ice melts back into liquid water in the sun. And some of the water seems to disappear! It turns into water vapor — a gas we cannot see.
These same changes happen all around Earth. Oceans hold most of Earth's water as a liquid. Glaciers and the ice caps at the North and South Poles hold water as solid ice. And there is always water vapor in the air around us.
Places Where Water Is Found on Earth
| Place | Form of Water |
|---|---|
| 🌊 Oceans and seas | Liquid |
| 🏞️ Rivers and streams | Liquid |
| 🏔️ Glaciers and ice caps | Solid (ice) |
| ❄️ Snow on mountains | Solid (snow) |
| ☁️ Clouds | Tiny water drops and ice |
| 💨 Air around us | Gas (water vapor) |
| 🌧️ Rain | Liquid |
| 🕳️ Underground | Liquid |
Do You See the Pattern? 🔁
Scientists always look for patterns. A pattern is when something happens the same way again and again.
Here is a pattern we can see with water: When things get cold, water turns into a solid. When things get warm, water turns into a liquid or a gas. Temperature makes water change!
This same pattern happens in other places too. Let's look!
| When It Gets Cold... | When It Gets Warm... |
|---|---|
| ❄️ Puddles freeze into ice | ☀️ Ice melts into water |
| 🧊 Water in pipes can freeze | 💧 Frozen pipes thaw and flow |
| ⛄ Snow covers the ground | 🌸 Snow melts in spring |
| 🏔️ Mountain tops stay icy | 🏞️ Warm valleys have flowing rivers |
Water in Our Lives 🌍
People use science about water every day! Here are some ways people use what they know about water and its forms.
❄️ Keeping Food Fresh
🌧️ Collecting Rainwater
Try this: On a humid day, put a cold glass of water outside. Watch what happens to the outside of the glass. Where did those water drops come from? They came from water vapor in the air!
Key Vocabulary 📖
- Liquid — Water that flows and you can pour. The water you drink is a liquid.
- Solid — Water that is hard and frozen. Ice and snow are solid water.
- Water vapor — Water that has turned into a gas. You cannot see it, but it is in the air all around us.
- Freeze — When liquid water gets very cold and turns into ice.
- Melt — When ice gets warm and turns back into liquid water.