2011年11月30日星期三

Water Cycle 水的循环


1. When the s _ _ shines on the sea, warm air rises and 
    forms water v _ _ _ _ _. This is called
    e _ _ _ _ _ _ _ _ _ _

2. The water vapour in the air c _ _ _ _ _ _ _ _ into lots of 
    tiny drops of water so small that we cannot see them. 

3. The tiny droplets bump into each other forming bigger 
    drops that we can see as a c _ _ _ _

4. When the drops are big and heavy they fall as r _ _ _
    hail or s _ _ _

5. This falls onto the land and into the rivers. The  
    r _ _ _ _ _  flow into the sea and everything starts again.


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