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Old 2011-09-04, 20:14   #1
aymanmikhail
 
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Default Evidence for the Origin of Water on Earth

Is there any evidence for the origin of water on Earth?
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Old 2011-09-04, 20:33   #2
xilman
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Quote:
Originally Posted by aymanmikhail View Post
Is there any evidence for the origin of water on Earth?
In what sense?

The observation that the earth has water now tells us that it came to the earth, or the earth's precursor, at some point in history.

O-16 is a very common nuclide in the universe, being the second stage of helium fusion (the first being C-12) and hydrogen is the commonest at all. You'd expect hydrides of oxygen, such as OH, OH-, OH+ and H2O to be common where temperatures are low enough such as the atmosphere of cool stars (OH has been detected in the solar spectrum, for instance), in interstellar molecular clouds and in planets. The earth's atmosphere presumably came from the IMC around the early sun, either directly or subsequently through cometary impact.


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Old 2011-09-06, 01:40   #3
aymanmikhail
 
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In the sense that the first 500 million years of Earth's rock history is lost, and that comets are not the likely source.
http://neo.jpl.nasa.gov/news/news008.html

What do you think of CEE (Cool Early Earth) theory?
http://www.geology.wisc.edu/outcrop/...cool_early.pdf
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