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Contents of 8.1 How do geologists know about rocks in Earth's interior?

8.1 How do geologists know about rocks in Earth's interior?

• Some rocks seen at Earth's surface originated at 10-50 km depth, with some few from as far as 150 km depth. These rocks are generally felsic continental crust or mafic oceanic overlying a peridotite mantle.
• The rocks near Earth's surface cannot explain the planet's density. The high density (and wobbles) indicate a core material that is much denser than peridotite.