EESA10H3 : lec 3 water
18 Jan 2012
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Document Summary
Which statements are true \: the earth is water planet, water covers 71 % of the earth surface, mostly salt water, no species can do without water, sculpting the earth"s surface, moderating climate, removing and diluting wastes and pollutants. Only a tiny fraction by volume of the world"s water supply is fresh water available for human use. Readily accessible fresh water: lakes 0. 007% soil moisture 0. 005%. c biota 0. 001, atmospheric water vapout 0. 001% Data use in the 21 st century in world commission? ( stress on the world"s major river basins ): water stress < 1700 cubic meters / year / person, water scarcity < 1000 cubic meters/ year / person. Stress on the world"s major river basins, based on a comparison of: the amount of water available with amount used by humans . The satellite images show the aral sea in (a) 1976 and (b) 1997.
