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Answer 1

The layers that make up the upper mantle are the following.

• The lithosphere and the asthenosphere.
• The lithosphere and the asthenosphere are the layers that make up the upper mantle.
• The rocky outer part of the Earth is called the lithosphere.
• It is very rigid, solid, and it is not as hot as the other parts.
• According to scientists, its thickness is about 90 to 100 kilometers from the surface of the earth.
• The layer of the Earth that moves the lithospheric plates is called the asthenosphere.
• Lithospheric plates are 60 miles long on average and are composed of continental crust.

We conclude that the lithosphere and the asthenosphere are the layers that make up the upper mantle. The new lithosphere is being created at oceanic ridges due to plate tectonics. Yes, planet Earth is getting larger constantly.

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