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the lithosphere is the solid upper part of the mantle and the crust, which are spilt up into plates on the earth surface, which are constantly moving. at destructive plate boundaries the plates can get subducted and "recycled" into the mantle, hence lithosphere is destroyed. at mid ocean ridges new crust (lithopshere) is constantly being made. this all leads to the dynamic and continuous cycles of lithosphere being destroyed and created, hence continually changing.

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12y ago
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8y ago

Because the Earth's core is as hot as the surface of the Sun and this is driving slow convection current movements.

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Q: Why does the lithosphere constantly keep changing?
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