水对人类的贡献

The impact of water
1.Impact on the climate
Water has a regulatory role on the climate.Atmospheric water vapor can stop 60% of the Earth's radiation protection of the Earth will not cool.Marine and terrestrial water bodies can absorb and accumulate in the summer heat,so that the temperature not too high; in winter,heat can be released slowly,so that the temperature not too low.
Marine and surface water evaporates into the sky in the form of clouds,cloud water by precipitation falling as rain,snow in winter becomes.Fall in the underground infiltration of surface water on the formation of groundwater; groundwater strata and from that came to form a spring,through streams,rivers and the sea to import.The formation of a water cycle.
Rain and snow precipitation events such as the formation of an important influence on the climate.In temperate monsoon climate,the summer monsoon brings a wealth of water,gas,wet summer and autumn,winter and spring than to form a clear wet and dry two quarters.
2.The impact of geography
71% of the earth's surface is covered with water from the air point of view,the Earth is a blue planet.Water,rock and soil erosion,river erosion and deposition,removal of sediment,and create a plain,to change the surface morphology.
The Earth's surface water bodies constitute the hydrosphere,including the oceans,rivers,lakes,swamps,glaciers,snow,groundwater and atmospheric water.As the injected water with some sea salt,plus perennial accumulation and evaporation,sea and ocean where the water is salt water and can not be directly consumed.Some lakes,the water is brackish.The world's largest body of water the Pacific Ocean.Great Lakes in North America is the largest freshwater river systems.Eurasia on the Caspian Sea is the largest saltwater lake.
Sheung Shui,there are about the size of the Earth's 1.36 billion cubic km.Ocean accounted for 1.32 billion cubic kilometers (or 97.2%); glaciers and ice caps account for 25 million cubic kilometers (or 1.8%); groundwater accounts for 13 million cubic kilometers (or 0.9%); lakes,inland sea,and river water accounted for 250 000 cubic kilometers (or 0.02%); of atmospheric water vapor at any known time accounted for 13 000 cubic kilometers (or 0.001%).
3.The impact of life
Life on Earth first emerged in the water.Water is all life an important part of the body.The body of water accounted for 70% of body weight; water is an essential life-sustaining substances,people are still drinking water quality requirements,if the water and the lack of the necessary elements of the human body or certain hazardous substances,or contaminated water,up to Less than drinking requirements,it will affect human health.Life in the water with a large number of aquatic vegetation and other aquatic life.
Of water is conducive to the conduct of chemical reactions in vivo,in vivo transport of substances also play a role.Water temperatures for the maintenance of the stability of the organisms played a big part.