How does the impact theory of the origin of the Moon account for the differences between the chemical compositions of the Earth and the Moon?

Question

Quizplus · Accepted Answer

The impact theory suggests that the Moon formed from debris that was ejected into space after a Mars-sized body collided with the Earth. Therefore, it is expected that the composition of the Moon would be similar to the material that made up the impacting body rather than the Earth. This explains the differences between the chemical compositions of the two bodies.

How Does the Impact Theory of the Origin of the Moon