Question

how does the size of the moon's core support the impact theory of the moon's formation?
please help and thank you

Answer 1

It is mostly speculation. The idea is that a space object, large, with an iron core, hit early Earth, easily penetrating Earth's crust. Most of the core material joined with Earth's core, however, the impact through off a considerable amount of mantle material, and some magma, which formed the moon. The loss of the iron core made the new Moon with a small core.

there are a lot of problems still with this theory.