This document discusses the formation of the Earth and Moon. It describes how gravity caused matter to accumulate during accretion, forming the Earth and Moon. The Moon has impact craters and dark basins called maria because it was bombarded by objects after forming. In contrast, the Earth is semi-molten and had rings during formation, resulting in a larger but less cratered surface than the Moon. The relationship between the Earth and Moon also affected their development, with the Moon becoming cooler, more spherical, and lacking iron in its core compared to the darker and rotationally axis tilted Earth.