How do geologists learn about Earth's interior?
What will be an ideal response?
Answer: "Some rocks seen at Earth's surface formed as much as 50 kilometers or (rarely) as far as 150 kilometers below the surface. These rocks reveal mostly felsic continental crust and mafic oceanic crust, both of which overlie peridotite mantle. The rocks found near the surface cannot account for the density of the whole Earth. Along with wobbles in Earth's rotation, the high overall density of the planet implies a central core of material that is much denser than mantle peridotite."
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