The earth is a watery place but just how much water exists on in and above our planet about 71 percent of the earths surface is water covered and the oceans hold about 965 percent of all earths water water also exists in the air as water vapor in rivers and lakes in icecaps and glaciers in the ground as soil moisture and in aquifers and even in you and your dog. The origin of water on earth or the reason that there is clearly more liquid water on earth than on the other rocky planets of the solar system is not completely understood. The earth is often compared to a majestic blue marble especially by those privileged few who have gazed upon it from orbit this is due to the prevalence of water on the planets surface. Liquid water is essential for microbial function and bodies of water on earth that support populations of cells can vary enormously in scale from oceans or lakes to thin films of water
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