So as I understand it the moon was formed when a chunk of earth was blown into orbit when a mars like planet collided with earth, if this is the case why is the composition of moon rock not similar to the composition of rock found on earth, when the moon if just a piece of the earth its self?
In: Planetary Science
Regardless of the source, as others have addressed that, Moon rocks are very different from Earth rocks because of weathering and cycling. Water and weather have had large effects on the elements in Earth rocks, and their shapes. Everything on the Moos in razor sharp as a result. The Moon is also dead, there is no tectonic activity over a molten core. The Earth has plate tectonics, which produce lava and other metamorphic rocks; it essentially recycles rock into and out of the molten core.
These are the differences that made Moon rocks special, they are closer to their original state.
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