Earth's crust

hard surface of the earth, stone and soil that covers the earth's surface

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. The boundary between the crust and mantle is conventionally placed at the Mohorovicic discontinuity, a boundary defined by a contrast in seismic velocity. Earth's crust occupies less than 1% of Earth's volume.
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Noun
1. the outer layer of the Earth
(synonym) crust
(hypernym) layer
(hyponym) horst
(part-holonym) lithosphere, geosphere
(substance-meronym) sial
(part-meronym) asthenosphere