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CrustCrust can refer to the outer layer of a planet. Planetary crusts are generally composed of a less dense material than that of deeper layers. On partially-molten planets, such as Earth, the crust is floating on fluid interior layers. Such floating crusts are often broken into tectonic plates that, because of fluidity underneath, can move (see continental drift).
Crust can refer to the outer edge of baked bread or the shell of a pie. 
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This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Crust".