In most cases, the distance between the seismically slow upwelling zone and the closest downwelling zone is
A) much greater than the thickness of the convecting mass.
B) much less than the thickness of the convecting mass.
C) about the same as the thickness of the convecting mass.
D) about the same as the thickness of the mantle.

Question

Quizplus · Accepted Answer

The distance between the seismically slow upwelling zone and the closest downwelling zone is typically much greater than the thickness of the convecting mass, reflecting the broad spatial scale of mantle convection patterns compared to the thickness of individual convecting layers.

In Most Cases, the Distance Between the Seismically Slow Upwelling