Crust 1
Crust 1 : (n.) A hard outer layer that covers something. Syn: Encrustation, Incrustation. Types: Calculus, Tartar, Tophus: An incrustation that forms on the teeth and gums. Type of: Cover, Covering, Natural Covering: A natural object that covers or envelops. The outer layer of the Earth. Syn: Earth's Crust. Types: (1) Horst: A ridge of the earth's crust that has been forced upward between two faults and so is higher than the surrounding land. (2) Crustal Plate, Plate: A rigid layer of the Earth's crust that is believed to drift slowly. Type of: Layer: A relatively thin sheetlike expanse or region lying over or under another. (v.) Form a crust or form into a crust. Type of: Change Surface: Undergo or cause to undergo a change in the surface
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