<P> In geology, the crust is the outermost solid shell of a rocky planet, dwarf planet, or natural satellite . It is usually distinguished from the underlying mantle by its chemical makeup; however, in the case of icy satellites, it may be distinguished based on its phase (solid crust vs. liquid mantle). </P> <P> The crusts of Earth, Moon, Mercury, Venus, Mars, Io, and other planetary bodies formed via igneous processes, and were later modified by erosion, impact cratering, volcanism, and sedimentation . </P>

The crust of our planet that is made of rock and soil is what layer