Topic
crust.
outermost solid shell of a rocky planet, dwarf planet or natural satellite, which is chemically distinct from the underlying mantle
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About crust
In geology, the crust is the outermost solid shell of a 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 defined based on its phase.
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