The Moon has nothing to speak of in the way of atmosphere, it appears to be geologically inactive. We also now suspect that the Moon, unlike the other natural satellites, was formed after a catastrophic collision with the early Earth. The process of formation may have looked like this. What evidence is there of this collision? The Apollo Moon Program gathered a large amount of data from the Moon.
Carpe Caelum Planetary Astronomy
Carpe Caelum Planetary Astronomy