Summary:

  • The lithosphere is the outermost mechanical layer, which behaves as a brittle, rigid solid.
  • The asthenosphere is solid upper mantle material that is so hot that it behaves plastically and can flow.
  • The lithosphere rides on the asthenosphere.
  • The asthenosphere is solid upper mantle material that is so hot that it behaves plastically and can flow.
  • The lithosphere rides on the asthenosphere.
  • The asthenosphere is solid upper mantle material that is so hot that
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