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Concerning aqueous data

provenance:Gz Yibao

Date Added:2006-03-04

Fresh water resources of world
Many persons chase the Earth imagination as a star of deep blue color, its 71% surface accumulates to overlay the water.In fact,97.5% water is a salt water on the earth, only 2.5% is a fresh water.But in the fresh water, nearly 70% congelation is in South Pole and Greenland of ice cover, rest of big the part is humidity in the soil or deep groundwaters, anding is hard to mine to provide the mankind to use.The water of sources such as river's river, lake, reservoir and the shallow layer groundwater etc. is easy to mine to provide the mankind with the direct usage more, but 1% of the not enough world fresh water of its quantity, about cover the ball up all 0.007%s of water.The world lands annually at big six up of decline the amount of water about 110 the trillions sign the square rice, deducting the atmosphere evaporation and drive the water that plant absorb quantity, in the world river the river path discharge about 42.7 the trillions sign the square rice, the population of the world that is by 1995 calculation, everybody the average water that can acquire measures to 7300 to sign the square rice annually.Because the population of world increases continuously, this the average number has already descended 37% in 1970 more.
The water resources of all countries line up
International community and region because of the geography environment dissimilarity, the quantity difference that owns the resources of water is very big.Press resources of water to have great capacity small line up, ex- severals one by one in order is:Brazil, Russia, Canada, China, the United States, Indonesia, Bengalese country, India.If press population average, be another a kind of result.The Chinese are all only equal to person's equivalence of world of the water resources quantity of 1/4.

The nation of the serious water shortage

65% concentration of the fresh water resources of world is in 10 nations, but have 40%80 national but serious water shortageses of populations.

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