If the current theory of the formation of the Moon is correct, all but one of these statements about Earth before the Moon's creation is true. Which one?
A) It was season-less.
B) Its mantle was significantly larger than it is at present.
C) Its iron core was significantly larger than it is at present.
D) Earth rotated faster than it does now.

Question

Quizplus · Accepted Answer

The current theory of the Moon's formation suggests that a Mars-sized body collided with the early Earth, ejecting material that eventually formed the Moon. This event would not have significantly altered the size of Earth's iron core, making option C incorrect. The other options (A, B, D) are consistent with the effects of such a collision: Earth would have had less pronounced seasons (if any) due to a more upright axial tilt (A), its mantle would have been larger before losing material in the collision (B), and Earth's rotation would have been faster before the Moon's creation slowed it down (D).

If the Current Theory of the Formation of the Moon