It was such a cataclysmic event that the earth swallowed up the body that crashed into it, absorbing it into it's own mass and increasing it to it's current size. Another major side effect of the collision was the ejection of a large chunk of earth's rock which was sent into orbit around the earth, becoming its moon. The rocks that were collected from the moon have been studied extensively for their mineral composition. Rocks made of basalt from volcanic eruptions and minerals, such as plagioclase feldspar and olivine , are exactly the kinds of rocks we find here on earth. In striking contrast to the true soils that we have here on earth, there are no organic materials in moon dust.
Organic materials come from the breakdown of living things, such as trees and animals.
Since there's nothing living on the moon, the soil is not a true soil like we're used to here. It's gray with very fine grained particles like sand or even dust and extremely dry because there is no water on the moon. You're not alone, as humans throughout history have also gazed at the very same moon and seen that same face. Because of it's rotation and orbit we have always seen the same side of the moon, the side with the face. Humans have been watching the mysterious moon since the beginning of time.