According to the concept of isostasy, lighter, less dense, continental crust "floats" higher on the mantle than denser oceanic crust.

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This is the basic principle of isostasy, which helps to explain the equilibrium between the Earth's crust and mantle. The thicker and less dense continental crust floats higher, while the thinner and denser oceanic crust sinks lower, in order to maintain balance.

According to the Concept of Isostasy, Lighter, Less Dense, Continental