<P> In geology , the crust is the outermost solid shell of a rocky planet , dwarf planet or natural satellite , which is chemically distinct from the underlying mantle . The crusts of Earth , the 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 . The Earth 's crust is composed of distinctly different continental crust and oceanic crust , which have different chemical compositions and physical properties , and which were formed by different geological processes . </P>
<P> In geology , the crust is the outermost solid shell of a rocky planet , dwarf planet or natural satellite , which is chemically distinct from the underlying mantle . The crusts of Earth , the 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 . The Earth 's crust is composed of distinctly different continental crust and oceanic crust , which have different chemical compositions and physical properties , and which were formed by different geological processes . </P>
what are two types of crust on the earths surface
what are two types of crust on the earths surface
continental oceanic
continental oceanic