seegongsik
Grade 1 (age 6-7)

grade 1 Water Cycle

We use water to drink, wash and cook, and it is also in the clouds and rain, in flowing rivers and in the wide sea. When water gets very cold it freezes into hard ice, and when it warms up it turns into invisible water vapor that mixes into the air. So sea water warmed by the Sun rises as vapor, cools high in the sky into clouds, falls as rain and flows down rivers back to the sea; this is called the water cycle. Step through the stages in the picture to follow water around the loop from rain to clouds.

Where does water come from and go?

Rain
💧 Water's journey
①Rain falls from the sky
②Rainwater runs over the ground and gathers in rivers
③Rivers flow downhill and gather in the sea
④Sea water warmed by the Sun turns into invisible vapor and rises into the sky
⑤High up, the vapor cools into tiny droplets that make clouds, and when the droplets grow big enough they fall as rain again

Water changes form

🧊 Water changes form
①When water gets very cold it freezes into ice (a solid)
②When water warms up it turns into vapor (a gas) and spreads into the air; it does this fastest when it boils, but it also happens without boiling, as when wet laundry dries
③When vapor cools it turns back into tiny droplets (a liquid)
④The white steam from a kettle and clouds are made of tiny droplets; vapor itself is invisible

Precious water

🌏 Water on the Earth
①About 70% of the Earth's surface is covered with water, but most of it is salty sea water, so very little can be drunk as it is
②A person who goes without water for just a few days is in danger
③Plants and animals all need water to live
④That is why it matters to save water and keep it clean

Summary

🎯 The water cycle in short
①Water goes around in this order: rain → river → sea → vapor → clouds → rain
②This is called the water cycle
③Water takes three forms: ice, water and vapor
④Every living thing needs water

Examples and Unit Test

Example 1
Starting from rain, in what order does water travel?
1
When rain falls from the sky, the rainwater flows into rivers.
2
The rivers gather in the sea, and sea water rises as vapor and becomes clouds.
▸ Rain → river → sea → vapor → clouds → rain again
Step through the picture from stage 1 to stage 5 to see water's whole loop.
Example 2
What three forms does water take?
1
Freeze water and it becomes hard ice; warm it and it becomes vapor.
2
When vapor cools it turns back into droplets. It is all the same water.
▸ Ice (solid) · water (liquid) · vapor (gas)
Depending on temperature, the same water changes into ice, water or vapor.
Unit Test
What does water become when it freezes?
①Vapor
②Ice
③Cloud
④Rain
⑤River
▸ ② Ice
1
When water is cooled until it freezes, it becomes hard ice (a solid).
2
When water is warmed it becomes vapor (a gas), and when vapor cools it turns back into water.
← Previous
Day & Night
Next →
Earth, Our Home

Last updated