noun
the rigid outer part of the earth, consisting of the crust and upper mantle
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The lithosphere is the rigid outer layer of the Earth, consisting of the crust and upper mantle.
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The lithosphere is like the Earth's outer shell, made up of the crust and upper mantle.
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The lithosphere is basically the Earth's tough outer skin, with the crust and upper mantle.
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Think of the lithosphere as the Earth's protective armor, composed of the crust and upper mantle.