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The short answer is, it's made out of the remains of a magma ocean that got knocked off of the Earth during a giant impact event some 4.4 billion years ago. This magma ocean crystallized in the vacuum of space and over time became the sphere that we know today. If you want to get into specific chemical composition, the crust is made out of oxygen, silicon, magnesium, iron, calcium, and aluminium. The mantle, meanwhile, is made of the minerals olivine, orthopyroxene, clinopyroxene, and ilmenite i dont think that the moon is a piece of the earth the iron balance is all wrong but it fits that maybe the earth was hit by a very large sized object and the debris caused the impacts that we see on the moons surface The moon is just to far away and must have move in from somewhere else I concur with composition

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