ESS102H1 Lecture : Lecture 5
Document Summary
Water on earth is found in several reservoirs: oceans, cryosphere (ice caps and glaciers), groundwater, lakes, soils, atmosphere, rivers, and living organisms. The average length of time that water stays in a particular reservoir is called the residence time. Water constantly moves from reservoir to reservoir. Water in ocean evaporates into the atmosphere. It then condenses into clouds and then rain down back into the ocean or blown onto land. Some water runs off the land and makes it back into the stream, lake, ocean. Some water gets absorbed into the soil and becomes groundwater. Water that evaporates from trees go through evapotranspiration. Most freshwater is tied up in ice. Most of the tiny part of freshwater that is usable is in lakes. Trenches are found at a convergent zone where one plate is subducting under the other. S deep layer: the layers are separated by thermocline: depth interval where temperature gradient changes the greatest.
