5. Why the thickness of the earth's crust varies widely between continental masses and the ocean floor?
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These varying thickness of earth's crust is basically due to continuous disturbances occurring beneath the earth crust. Our earth is consists of three layers, i.e., 1)Crust 2)mantle 3)core. ... So, due to molten core the inner layer of mantle also get heat up and become molten too and start moving towards the surface.
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The thickness difference is essentially because the oceanic crust is much younger than continental crust. Additionally the crust below the ocean is constantly being recycled at subduction zones.
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