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Well it is impossible for the human race to, but years of rain could if it kept falling rapidly for about 40 days.

Ans 2.

The origin of Earth's oceans, or if you like all the water on the planet, has been an unsolved puzzle to geophysicists for years. There is now a possible answer. The new theory sounds implausible at first hearing, but it is consistent with what evidence we have so far.

For some time geophysicists have cast suspicious eyes on comets; all of them contain water, and some are almost entirely ice. They don't collide with Earth very often nowadays, but the situation when the Solar system was in its early stage of formation was very different. Large numbers of comets impacted our planet (in fact all the planets) during the first billion or so years. That is between 4.5 BYA and 3.5 BYA. Unfortunately, the numbers don't quite work; the water contributed by comet impacts might have been enough to fill one small ocean, but probably not our large ones.

Well, here's the latest idea. The tonnage incoming from comets is tiny compared to the tonnage from meteorites. That didn't seem a very interesting fact until the recent discovery of water hidden inside most of the meteorites landing. This just might be what could produce an ocean.

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15y ago

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