Water in Nature
Grade 1 · Science · Study Guide
Explore where water is found in nature and how it moves around our planet!
Water is one of the most important things on Earth. Without water, nothing could live — not animals, not plants, not people! Water is found in many places: in oceans, rivers, lakes, ponds, and even underground. About three-quarters of our Earth is covered in water!
Water can exist in three different forms called states. As a liquid, water flows in rivers and falls as rain. When it gets very cold, water freezes into a solid — that is ice and snow. When water is heated, it turns into an invisible gas called water vapor and rises into the air. This is called evaporation.
Water moves through nature in a cycle. The Sun heats up water in oceans and lakes, turning it into water vapor that floats up into the sky. High in the sky, water vapor cools and forms clouds. When clouds collect enough water, it falls back down as rain or snow. This is called the water cycle, and it keeps repeating forever!
| State | What It Is | Example |
|---|---|---|
| Liquid | Water that flows and pours | Rain, rivers, drinking water |
| Solid | Frozen water | Ice cubes, snow, glaciers |
| Gas | Invisible water vapor | Steam from a hot drink, clouds forming |
Key terms
- liquid
- Water in its flowing form, like in rivers, rain, and drinking water.
- solid
- Water in its frozen form — ice and snow are water in solid form.
- water vapor
- Water in its gas form — invisible, it floats up into the air when water is heated.
- evaporation
- When liquid water is heated and turns into water vapor gas.
- water cycle
- The endless journey of water from oceans to sky to land and back again.
Flashcards
- water cycle
- The continuous movement of water from Earth to sky and back again.
- evaporation
- When heat turns liquid water into invisible water vapor gas.
- liquid
- The flowing form of water found in rivers, rain, and oceans.
- solid
- The frozen form of water — ice and snow.
- water vapor
- Water in gas form — invisible and lighter than air.
- precipitation
- Water that falls from clouds as rain, snow, sleet, or hail.
Practice questions
What are the three states of water?
- Hot, cold, warm
- Liquid, solid, gas
- Rain, snow, ice
- Salty, sweet, pure
Show answer
Answer: Liquid, solid, gas
Water is unique because it naturally exists in all three states of matter on Earth.
Ice is water in its solid state.
Show answer
Answer: True
When water gets cold enough (32°F / 0°C), it freezes into the solid state we call ice.
What is evaporation?
- When water freezes into ice
- When water falls as rain
- When liquid water turns into water vapor
- When clouds form
Show answer
Answer: When liquid water turns into water vapor
The Sun's energy heats water, causing molecules to escape into the air as invisible water vapor gas.
Most of Earth's water is found in rivers and lakes.
Show answer
Answer: False
About 97% of Earth's water is in the oceans. Only a small fraction is in rivers, lakes, and freshwater sources.
The endless movement of water from oceans to sky to land is called the water ___.
Show answer
Answer: cycle
The water cycle is a continuous loop: evaporation → cloud formation → precipitation → back to evaporation.
Fun facts
- About 97% of all Earth's water is in the salty oceans — only 3% is fresh water we can drink!
- A single cloud can weigh more than a million pounds!
- Water is the only natural substance found on Earth in all three states — solid, liquid, and gas.
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