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Is there any geological evidence to support the need for such an “outside” source of water as the small comets?

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Is there any geological evidence to support the need for such an “outside” source of water as the small comets?

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There is indeed. In 1999, David Deming, a geologist at the University of Oklahoma, published a refereed paper [Palaeo, 146, 33-51, 1999] which has attracted the attention of many scientists. His work points out that recent investigations of the movement of oceanic continental plates into the mantle, known as subduction, show that the loss rates for the water on this planet are very large as the plates carry the water deep below the surface. So unless there is an influx of water to our planet on time scales much shorter than its age of 4 billion years or so, our planet would be presently “dry as a bone.” Remarkably the necessary influx of water from interplanetary space agrees quite well with what the small comets are calculated to be bringing to the Earth.

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