Definition of lithosphere
: the solid part of a celestial body (such as the earth)
specifically
: the outer part of the solid earth composed of rock essentially like that exposed at the surface, consisting of the crust and outermost layer of the mantle, and usually considered to be about 60 miles (100 kilometers) in thickness
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Merriam-Webster unabridged
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Time Traveler for lithosphere
The first known use of lithosphere was in 1887
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