Question

question 13 of 25
how do the rocks in the mantle move?
a. they move on top of the crust.
b. they move in convection currents.
c. they do not move.
d. they flow like water.

Explanation:

The mantle is composed of semi - molten rock (magma). Heat from the core causes convection currents. In convection, hotter, less dense material rises, and cooler, denser material sinks. This creates a circular motion of the rocks in the mantle.

• Option A: The crust is on top of the mantle. So, rocks in the mantle do not move on top of the crust.
• Option B: Convection currents are the mechanism by which rocks in the mantle move.
• Option C: The rocks in the mantle do move due to convection currents.
• Option D: Although the mantle is semi - molten, it does not flow like water. The movement is due to convection currents.

Answer:

B. They move in convection currents.