Crust (geology)
OUTERMOST SOLID SHELL OF A ROCKY PLANET, DWARF PLANET OR NATURAL SATELLITE, WHICH IS CHEMICALLY DISTINCT FROM THE UNDERLYING MANTLE
Crust(geology); Crust (earth science)
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.