The Earth is not a perfect sphere because it is spinning with respect to most of the universe. The Sun and Moon raise tides on this body and its oceans that drag and exert friction on the planet as it rotates, and the Sun and Moon exert torques on the planet too because of the equatorial bulge. Pick the consequences that:. a. The Moon moving farther away from Earth to conserve system total angular momentum.
b. A speeding up of Earth's rotation.
c. A lengthening of the day by a second every few years.
d. The direction of Earth's axis precessing around the plane of its orbit.