Parcels of rising mantle are always ________ than adjacent rocks, and parcels of sinking upper mantle are always ________ than adjacent rocks.
A) more dense; less dense
B) heavier; lighter
C) warmer; cooler
D) more basaltic; less basaltic

Question

Quizplus · Accepted Answer

Parcels of rising mantle are warmer because they have been heated from below, making them less dense and causing them to rise. Conversely, parcels of sinking upper mantle are cooler than their surroundings, making them denser and causing them to sink.

Parcels of Rising Mantle Are Always ________ Than Adjacent Rocks