ENV100Y5 Lecture Notes - Lecture 4: Ocean Current, Nutrient Pollution, Silt
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ENV100Y5 Full Course Notes
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Env100: module 4 session 37 & 38 (freshwater) Makes earth different from all other planets. Important in moving heat from equator to the poles. Water is locked up in minerals in the earth"s mantle . Makes the mantle elastic; affects the dynamics of plate tectonics. May be the largest water reservoir on the planet. Unknown how much cycles between internal and surface reservoirs through tectonics. Study of water in the hydrosphere, both on and under the ground. Only 2. 5% of earth"s water is fresh. Most of this is tied up in glaciers and ice caps. We can approach the hydrologic cycle from a systems perspective . Processes: precipitation, surface runoff, infiltration, percolation, evaporation, and transpiration. Fluxes: the global hydrologic cycle maintains mass balance-total amount of water is fixed. Local variations affect supply and cause problems like floods and droughts. Solar energy and gravity drive the hydrologic cycle . Water from rain, snowmelt, and springs runoff over the surface.
