H2O Life Cycle

 Water Life Cycle

The water cycle (known scientifically as the hydrologic cycle) refers to the continuous exchange of water within the hydrosphere, between the atmosphere, soil H2O, surface water, groundwater, and plants. Water moves perpetually through each of these regions in the H2O cycle consisting of following transfer processes:

• Evaporation from oceans and other water bodies into the air and transpiration from land plants and animals into air.
• precipitation from water vapor condensing from the air and reaching earth or ocean.
• Runoff from the land usually reaching the sea.

Most H2O vapor over the oceans returns to the oceans, but winds over land at the same rate as runoff into the water vapor carry sea, about 36 Tt per year. Over land, evaporation and transpiration contribute another 71 Tt per year. Precipitation, at a rate of 107 Tt per year over land, has several forms: most commonly rain, snow, and hail, with some contribution from fog and dew.

Condensed water in the air may also refract sunlight to produce rainbows. H2O runoff often collects over watersheds flowing into rivers. A mathematical model used to simulate river or stream flow and calculate water quality parameters is hydrological transport model.

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Some of H2O is diverted to irrigation for agriculture. Rivers and seas offer opportunity for travel and commerce. Through erosion, runoff shapes the environment creating river valleys and deltas which provide rich soil and level ground for the establishment of population centers. A flood occurs when a low - lying area of ​​land is covered with water.

That is when a river overflows its banks, it causes floods. A drought is an extended period of months or years when a region notes a deficiency in its H2O supply. This occurs when a region receives consistently below average precipitation.