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SlideshowReport

The hydrologic cycle "الدورة الهيدرولوجية"

Description
Water is essential for biochemical reactions and is involved in nearly every environmental system
Oceans are the main reservoir (97% of water)
Evaporation = water moves from aquatic and land systems to air
Transpiration = release of water vapor by plants
Precipitation = condensation of water vapor as rain or snow
Aquifers = underground reservoirs of sponge-like regions of rock and soil that hold groundwater
Groundwater = water found underground beneath layers of soil
Water table = the upper limit of groundwater held in an aquifer
Water may be ancient (thousands of years old)
Groundwater becomes exposed to the air where the water table reaches the surface
Damming rivers increases evaporation and infiltration
Altering the surface and vegetation increases runoff and erosion
Spreading water on agricultural fields depletes rivers, lakes and streams
Removing forests and vegetation reduces transpiration and lowers water tables
Emitting pollutants changes the nature of precipitation
The most threatening impact is overdrawing groundwater for drinking, irrigation, and industrial use

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