• Crust, mantle, and core differ from each other in chemical composition.
  • Earth’s crust is a thin, brittle outer shell.
  • The crust is made of rock.
  • This layer is thinner under the oceans and much thicker in mountain ranges.
  • There are two kinds of crust.
  • Oceanic crust is thinner and denser than continental crust.
  • Continental crust is much thicker than oceanic crust.
  • It is 35 kilometers (22 miles) thick on average.
  • All three major rock types—igneous, metamorphic, and sedimentary—are found in the crust.
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