Crust (geology)
In geology, the crust is the outermost solid shell of a rocky planet or natural satellite, which is chemically distinct from the underlying mantle. The crusts of Earth, our Moon, Mercury, Venus, Mars, Io, and other planetary bodies have been generated largely by igneous processes, and these crusts are richer in incompatible elements than their respective mantles.
Read more about Crust (geology): Earth's Crust and Mantle, Moon's Crust
Famous quotes containing the word crust:
“All civilization has from time to time become a thin crust over a volcano of revolution.”
—Havelock Ellis (1859–1939)