Environment: Deep Concern: Ground Water

At the very top of the environmental scientists' list of concerns about pollution damage be something that most Americans probably believe to be safely beyond the reach of contamination: ground water. This is water that lies buried from a stretches feet to a half mile or more beneath the land's surface in stretches of permeable rock, sand and gravel known as aquifers. In the U.S. there is five times as much water in such subterranean reservoirs as flows through all its surface lakes, streams and rivers in a year. While most ground water is believed to remain pure, concern is rising...

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