What is not a factor that separates the asthenosphere and the lower mantle into two distinct layers?
a. Temperature
b. Pressure
c. Density
d. Chemical composition
ANS: D
The chemical composition of the two layers is about the same. The temperature in the lower mantle is
higher likely due to the pressure. The increase in temperature makes the lower mantle denser.
Information can be found in the section Voyaging Combined with Science to Advance Ocean Studies.
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