Outside of the crust, the layer that scientists know the most about is the mantle.Other than via seismic waves, how else do geologists obtain information about the composition of the mantle?

Name: Outside of the crust, the layer that scientists know the most about is the mantle.Other than via seismic waves, how else do geologists obtain information about the composition of the mantle?
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Volcanoes can bring up material from the mantle to the surface, allowing scientists to study its composition directly.

Outside of the Crust, the Layer That Scientists Know the Most