Crust (geology)

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Geologic provinces o the warld (USGS)
  Extendit crust
Oceanic crust:
  0–20 Ma
  20–65 Ma
  >65 Ma

In geology, the crust is the ootermost solid shell o a rocky planet or naitural satellite, which is chemically distinct frae the unnerlyin mantle. The crusts o Yird, oor Muin, Mercur, Venus, Maurs, Io, an ither planetary bodies hae been generatit lairgely bi igneous processes, an these crusts are richer in incompatible elements than thair respective mantles.