GEOL107 Lecture Notes - Lecture 9: Evaporation, Surface Runoff, White Clay Creek
27 Jul 2018
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Where is it: 97. 2% ocean, 2. 15% glaciers and ice, 0. 63% groundwater, 0. 010% - lakes and rivers, 0. 008% - inland seas and saline lakes, 0. 0001% biosphere. 99. 35% of earth"s water is not a significant source of freshwater (water used for drinking, agriculture, and most industry) Movement of water (h2o) through earth"s reservoirs. Evaporation water changing from liquid to gas (water vapor) driven by heat from sun. Condensation water changing form gas to liquid - driven by water vapor moving up in. Earth"s lowermost atmospheric layer (troposphere) and being cooled. Precipitation condensed water vapor in troposphere falling back to earth"s surface as rain, snow. Surface runoff water flowing on land surface downhill to oceans. Over the oceans more evaporation than precipitation so oceans should be drying up. Over the land more precipitation than evaporation so land should be flooded by water. But, equilibrium exists between these two excesses.
