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Posted by Jonathan Silverlight on April 26, 2006, 5:31 pm
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>-> Just wondering.... (Mars/ Earth/ water questions..) From a
>-> geological viewpoint there would seem to have been a big increase in
>-> the amount of water on the Earth's surface at the same time as the
>-> mantle broke through the crust <Death of the Dinos> <bone beds>
><LIPS>
>
>Many remains of ancient creatures are found in areas that were seas
>then, but are dry land now, for example the large area of North America
>just east of the Rockies. There was obviously plenty of water back
>then. There's no reason to think that the quantity has increased much
>since.
>
>What's wrong with the comet theory? Really, the water on the Earth is
>just a thin film that doesn't even completely cover the surface. Less
>than one thousandth of the mass of the Earth consists of water. It
>seems perfectly plausible to me that impacts by icy comets after the
>Earth had cooled enough to allow liquid water on the surface could have
>brought all the water that we now have.
>
I posted something last month in reply to one of don findlay's posts,
saying that there is good evidence that water may be present throughout
the mantle and even in the core. Here's another article that says there
may be as much as 0.4 percent <http://www.ldolphin.org/deepwaters.html>
That thin film is just the visible part of a huge reservoir.
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