What are the differences in deuterium-to-hydrogen ratios between the earth and comets?

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Offline thedoc

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Claire asked the Naked Scientists:
   Hello,

I was wondering why the characteristic deuterium-to-hydrogen (D/H) ratio in Earth's oceans is much lower than the D/H ratio of many comets scientists have investigated?

Thank you
What do you think?
« Last Edit: 26/02/2016 13:50:02 by _system »