The Water Cycle, Revisited

This topic revisits the water cycle introduced earlier in the course, now framed as one of Earth's biogeochemical cycles: water moves continuously among reservoirs, including the ocean, atmosphere, ice, groundwater, and living things, and the total amount of water is essentially constant even though it takes different forms and moves at very different speeds through each reservoir. Some reservoirs, like the deep ocean and glacial ice, hold water for very long periods, while others, like the atmosphere, exchange it in a matter of days.

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