The Earth's rotation rate is slowing because of:
A) radioactive decays in its core
B) relativistic effects of gravity
C) tidal forces from the Moon
D) the gravitational force of the Sun
E) gravitational drag from dark matter

Question

Quizplus · Accepted Answer

The gravitational forces of the moon cause tides on Earth, which creates a tidal bulge that interacts with the Moon's gravity. As a result, the Earth's rotation slows down slightly. This effect is known as tidal braking. Over the course of several millennia, the slowing of Earth's rotation rate will lead to longer days.

The Earth's Rotation Rate Is Slowing Because Of