What is the definition of the earth's crust

“Crust” describes the outermost shell of a terrestrial planet.

Earth's crust is generally divided into older, thicker continental crust and younger, denser oceanic crust. Earth has three layers: the crust, the mantle, and the core. The crust is made of solid rocks and minerals.

answer:

sequence 1- deletion

                  2- duplication

                  3- insertion

                  4- substitute

                  5- inversion

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