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UNIT
2

Water Cycle

Water Cycle ATR3-1-02

All life on the Earth needs water. Plants

need water to grow. Animals need water

to survive. And we use fresh water every

day. However, 97 percent of the water

on the Earth is salt water in the oceans.

Only 3 percent of world’s water is fresh

water from rivers and lakes. Do you

1
worry whether we will run out of fresh
water?

2
ATR3-1-V02 Fortunately , water is constantly renewed by
3
the water cycle. The main source of fresh water

Vocabulary

1 run out : to become used up
2 fortunately : by good fortune
3 source : the place where something begins
18 4 evaporate : to change into a vapor