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The competing theory [of the origin of water] is that much of it came from
outer space (and is still comming). There are a lot of comet like fragments
floating around and current evidence suggests that huge quantities of these
fragments enter our atmosphere every day. Recognition of this possible source
does not alter the conclusion that most of our water is old. It just shows
that there is always more to learn
A simple calculation shows that the abundance of U235 was as follows:
t= 1 billion 2 billion 3 billion 3.7 billion 4 billion 5 billion
1.6% 3.6% 7.8% 13% 16% 30%
Why is the isotopic abundance of U-235 so uniform on earth, except
for Oklo?