Seismic evidence suggests that Earth's core spins about 2 $\degree$more per year than the surface. In roughly how many years will the surface and the core have the same relative orientation they do today?
A) 2
B) 50
C) 90
D) 180

Question

Quizplus · Accepted Answer

The core spins about 1 degree more per year than the surface. To complete a full 360-degree cycle and return to the same relative orientation, it would take 360 years (360 degrees / 1 degree per year).

Seismic Evidence Suggests That Earth's Core Spins About 2 °\degree° More Per Year Than the Surface

Seismic Evidence Suggests That Earth's Core Spins About 2 $\degree$ More Per Year Than the Surface