transfer of the element between many different geological, biological, atmospheric, and liquid systems. The cycles are largely controlled by and can act as indicators of past conditions of other factors such as the configuration and elevation of the continents, distribution of landmasses and vegetation, large volcanic eruptions, climate, and biological production. Geochemical cycles are generally divided into two types, those that occur near the Earth's surface (exogenic cycles) and those that occur in the deep interior (endogenic cycles).
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