We do not have a definitive answer to this question. Scientists are still researching this question as of 2015. However, if extraterrestrial, it certainly was not ONE extraterrestrial body.
it is water cycle
70% or 80% of water covers the earths surface
3/4 of the earth's surface is water.
69%
about 30%
the sun
Water.
Ground water.
the water cycle
71.13% of the earth is covered by water. Only 3% of that water is fresh water, the rest is salt water.
Roughly 71% of Earth is covered by water and because that is well over half there is more water than land on Earths surface
A mountain is a natural, large elevation in the Earths surface. A basin is a depression in the Earths surface containing water.