Although we do not yet know precisely how the Moon formed,an important clue is provided by the fact that:

Question

Quizplus · Accepted Answer

The fact that Moon rocks and minerals contain very little water or other volatile substances with low melting and boiling points suggests that the Moon formed from materials that were heated to high temperatures, which may have happened during a giant impact between the early Earth and a Mars-sized object. This impact would have vaporized much of the volatile substances, leaving behind a predominantly rocky and dry Moon. The other options do not provide as direct a clue about the Moon's formation.

Although We Do Not Yet Know Precisely How the Moon