Posted by Leo on Monday, February 15, 2010 at 6:15pm.
Use ratio/proportion as follows:
(4 g/1 x 10^6 g) = (x g/1 x 10^-3 g)
solve for x.
Or set it up by dimensional analysis.
1 x 10^-3(crust) x (4 g U/1 x 10^6 g C) = ??
Check my arithmetic. It looks like 4 x 10^-9 g or 4 ng/metric ton.
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