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Dinosaur eggshell Titanosauria Argentina
Geologically, rock is a solid material which is found beneath the surface of Earth’s crust. It consists of fragments (clasts) or of minerals. Deposits that have not yet hardened to become rock are geologically also considered to be rock. So, a loose layer of sand or a clay package is also rock. Even a package of land ice could be considered to be rock.
For more information, see the page about types of rock.
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