[Southack]

Basalt is just leftover lava. Lava flows on the seabed constantly.

Moon rocks are commonly called KREEPS because they contain Potassium (K) elements and Rare Earth Elements (REE) and Phosporus (P) not found in almost all rocks and mantle/crust of the Earth. Ditto for regolith. It’s on the Moon, not on the Earth.

Same again for Lunar norite, plagioclase, and pyroxene. Not exactly something you’d typically find on Earth (above or below our surface).

[muawiyah]

That's just from the surface where there's a vast amount of debris that's been brought in by meteors and comets.

The true composition of the Moon is known through inferential evaluation of it's size and density.

There are many things the Moon cannot be ~ e.g. a chunk of iron.