Friday, July 18, 2008

Water beneath your feet


All the earth's water isn't in seas, lakes, ponds, and rivers. A lot of it is beneath your feet - down in the ground.

When rain falls, much of the water seeps down through the soil. It keeps going until it reaches solid rock that it can't get through. Then it spreads out, filling every nook and cranny in the ground.

The top of this underground waters is called the water table. When there is a lot of rain, the water soon fills all the open spaces. Then the water table gets higher.

In some places the water table comes all the way to the top of the ground. Then, water bubbles out and makes a natural fountain called a spring. Sometimes a spring is the start of a river.

Underground water is cool and clean and good to drink. People often dig wells to get this water. There is some underground water almost everywhere in the world - even in deserts. But in a desert the water is very, very far down.

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