If the Earth's mantle is made of rock how can we say that the crust floats on the mantle?

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The Earth's crust is made of slightly lighter rock, so it floats on the molten rock that is the mantle.

2007-02-06 12:51:39 · answer #1 · answered by Anonymous · 0⤊ 0⤋

The mantle isn't actually rock it is only semi-solid. As I understand it like a putty.

2007-02-06 12:50:15 · answer #2 · answered by Roadkill 6 · 0⤊ 0⤋

http://en.wikipedia.org/wiki/Plate_tectonics

2007-02-06 12:50:22 · answer #3 · answered by phantomlimb7 6 · 0⤊ 0⤋