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the water cycle started when water was first created on earth by the combining of molecules. it is caused by change in temperature of the water and its surroundings. * Well - water was not actually "created" on earth - more than likely deposited here from comets that crashed here over billions of years.

^ that could be one of its sources, but then the earth would have way more craters and would have to be much larger because of the solid masses of the comets.

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16y ago

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