Biogeochemical cycle involving , , and forms that is influenced by biology but nonetheless which can largely function without biological influence.

The water cycle ultimately does involve biology – particularly in terms of evapotranspiration as well as in terms of slowing – but nonetheless is largely drive rather than biological forces. The cycle is primarily powered by the , which mediates , though also is drive by differences in the , which drives . , too, plays a role in moving water-laden over .

It is important to realize that as water plays roles in , it also can be both lost and regained. These losses occur in the course of carbon fixation, where water is combined with carbon dioxide to produce carbohydrate. Water in turn is gained in the course of cellular respiration where organic compounds are converted back to CO2 and water, generating what is known as metabolic water.

It is important to note that among the biogeochemical cycles, the water cycle is the simplest to grasp and this is primarily due to the smaller extent that chemistry is involved in the process (that is, it is mostly driven by physics and less so by either biology or chemistry). Nonetheless, the water cycle displays common threads with other biogeochemical processes including storage as () and movement between more or less forms. In the end, it's not that it truly is simpler than the other biogeochemical cycles, it's just that you can ignore much of the chemistry while still grasp much of the process.

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