Hydrosphere-definition, Types ( surface and ground water),
Distribution, Water conservation, Use and over exploitation,
Floods, Drought, dams-benefits and problems
The hydrosphere is composed of all of the water on or near
the earth. This includes the oceans, rivers, lakes, and even the
moisture in the air.
Ninety-seven percent of the earth's water is in the oceans. The
remaining three percent is fresh water; three-quarters of the fresh
water is solid and exists in ice sheets.
Surface and Ground water Groundwater refers to any subsurface
water that occurs beneath thewater table in soil and other geologic
forms. Groundwater makes up 95% of all freshwater available for
drinking. Groundwater is a significant source of water for many
municipal water supply systems. Rural residents, withdrawing their
water from wells, also rely upon groundwater. Surface water refers
to water occurring in lakes, rivers, streams, or other fresh water
sources used for drinking water supplies.
