too small to make a difference. The earth crust is too thin
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送交者: steven 于 2008-12-13, 23:46:22:
回答: what about a montain here and valley there, 由 whoami 于 2008-12-13, 23:09:11:
to make a difference. Including the lithosphere, it is only about 60km and the density is small.
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