The lithosphere and asthenosphere are both part of the upper mantle. How do scientists mark the boundary between the two? A) The lithosphere is much more ductile than the asthenosphere. B) The lithosphere deforms elastically, while the asthenosphere deforms viscously. C) The lithosphere deforms viscously, while the asthenosphere deforms elastically. D) The lithosphere remains rigid for very long periods of geologic time, while the asthenosphere deforms elastically.
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The lithosphere and asthenosphere are both part of the upper mantle. How do scientists mark the boundary between the two?
A) The lithosphere is much more ductile than the asthenosphere.
B) The lithosphere deforms elastically, while the asthenosphere deforms viscously. ☑️C) The lithosphere deforms viscously, while the asthenosphere deforms elastically. D) The lithosphere remains rigid for very long periods of geologic time, while the asthenosphere deforms elastically.
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