Water is just about everywhere on Earth-in the oceans glaciers,rivers,lakes,air,soil,and in living tissue (figure 5.1).All of these reservoirs Earth's the hydrosphere.in all,the water content of the water content of the hydrosphere comprises about 136 billion cubic kilometers million cubic miles, of 97.2 percent, is stored the global oceans ice sheets and glaciers account another 2.15 percent, leaving only 0.65 percent to be divided among lakes, streams, groundwater, and the atmosphere(see Figure 1.11, p. 12). Although the percentages of Earth's total water found in each of the latter sources is but a small fraction of the total inventory the absolute quantities are great