Ground water is water beneath the surface of the earth. It is the source of water for wells and many springs. Ground water accumulates chiefly from rain and melted snow that filters through the soil. It also collects from water that seeps into the ground from lakes and ponds. The water settles into the pores and cracks of underground rocks and into the spaces between grains of sand and pieces of gravel. A layer or bed of such porous material that yields useful amounts of ground water is called an aquifer. Wells are drilled down to aquifers to draw ground water to the surface. The level of ground water, called the water table, drops when more water is withdrawn than can be replaced naturally. Many regions of the world are using up the ground water faster than aquifers are being replenished.
Fact file
Pollution of ground water is a serious problem, especially near cities and industrial sites. Pollutants that seep into the ground result from contaminated surface water, leaks from sewer pipes and septic tanks, and chemical spills.
Population great effect on our life style .And our environment
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