Some of the water goes up into the (a)   .

2. When this air cools, the water turns into (a)   .

3. If the clouds get too heavy, it (a)   .

If it is very cold, it (a)   .

The rain and snow fall on the land

and the snow (a)   .

Some of this water goes under the (a)   .

And some water goes into (a)   and back to the sea.

All the water on (a)   is millions of years old.

The endless movement of water within the Earth and the atmosphere is called...

(a)