What keeps Earth's asthenosphere pliable?
a. Chemical composition of the asthenosphere
b. The density of the asthenosphere
c. Earth's internal heat
d. Insulation from the lithosphere
ANS: C
The asthenosphere remains pliable due to the internal heat of the Earth. This heat is thought to travel
through the Earth's interior via conduction. The lithosphere is able to remain in motion because of that
pliability. Information can be found in the section A New Understanding of Earth Evolved Slowly.
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