What is the definition of crust in science?

the outer layer of the earth, about 22 miles (35 km) deep under the continents (continental crust) and 6 miles (10 km) deep under the oceans (oceanic crust). Compare mantle (def 3), core 1 (def 10). a scab or eschar. Slang. unabashed self-assertiveness; nerve; gall: He had a lot of crust going to the party without an invitation. read more

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In geology, a crust is the outermost layer of a planet. The crust of the Earth is composed of a great variety of igneous, metamorphic, and sedimentary rocks. The crust is underlain by the mantle. The upper part of the mantle is composed mostly of peridotite, a rock denser than rocks common in the overlying crust. read more