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Earth's water is largely recycled by way of our continual water cycle that is facilitated by way of our planets natural processes. These include sbduction and the subsequent volcanic activity ( which produces more heat and above all, green house gases to continue the slow melting of our ice caps ) These are subsequently replenished by way of our natural rates of precipitation. However, in contemporary times, this cycle of great concern. We humans release green house gases in an un-natural manner. This 'may' upset the delicate balance of the melting and thus, the water cycle. It is also postulated that some amounts of water are introduced by way of small comets and other water rich debris entering earth's atmosphere on a yearly basis. This is however, how earth probably attained large amounts of water before the planet had a functioning water cycle and atmosphere.

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