Sedimentary

sedimentary rock

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|sedimentary rock |

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(¦sed·ə¦men·trē ′räk)

(petrology) A rock formed by consolidated sediment deposited in layers. Also known as derivative rock; neptunic rock, stratified rock.

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|Sci-Tech Encyclopedia: Sedimentary rocks |

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Rocks that accumulate at the surface of the Earth, under ambient temperatures. Together with extruded hot lavas, sedimentary rocks form a thin cover of stratified material (the stratisphere) over the deep-seated igneous and metamorphic rocks that constitute the bulk of the Earth's crust. Sediments cover about three-quarters of the land and of the ocean floor. The thickness of the stratisphere is generally measured in kilometers, and locally reaches about 15 km (50,000 ft). See also Earth crust; Igneous rocks; Metamorphic rocks;...