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How do we know that the interior of the Earth is less dense than the surface?...

How do we know that the interior of the Earth is less dense than the surface?

a) Measurements of the magnetic field suggest that the interior of the Earth contains a liquid, which must be less dense than the rocks found at the surface.

b) Because rocks on the surface of the Earth are denser than the Earth overall, therefore the interior must be less dense than the surface rocks.

c)None of the above.

Science   Advanced-Physics   
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