"Continental drift" on Earth is now thought to be caused by
A) tidal flexing of Earth's solid crust by the Moon's gravitational pull.
B) circulation currents in the deep interior, causing slabs of Earth's crust to move slowly.
C) precession of Earth's spin axis.
D) the forces of oceanic tides on the continental shelves around the landmasses.

Question

Quizplus · Accepted Answer

Continental drift is primarily caused by circulation currents in the Earth's mantle. These currents, driven by heat from the Earth's core, cause the movement of tectonic plates on the Earth's surface.

"Continental Drift" on Earth Is Now Thought to Be Caused