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Re: Sauropods vs. Gravity

> For example, a phase change in the core, mantle, or crust could cause the
> earth to be smaller in diameter now, which would result in greater gravity
at the
> surface (I don't believe to have been the case).

I don't either, because this would certainly have totally devastated the
surface -- again our very existence is good evidence suchlike didn't happen
in the last 4.4 Ga. :-)