Over millions of years, layers of sediment may build up and harden into sedimentary rock like this sandstone at Kaleidoscope Ridge, Arizona. Sandstone forms as tiny grains of sand harden into a single mass.

Photograph by James P. Blair

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sediment Encyclopedic Entry

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Encyclopedic entry. Sediment is solid material that is moved and deposited in a new location. Sediment can consist of rocks and minerals, as well as the remains of plants and animals.