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In geology and related fields, a stratum (plural: strata) is a layer of sedimentary rock or soil, or igneous rock that were formed at the earth's surface, with internally consistent characteristics that distinguish it from other layers.

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A metamorphic rock is a type of rock which has been changed by extreme heat and pressure.

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Rock that has formed through the deposition and solidification of sediment, especially sediment transported by water (rivers, lakes, and oceans), ice ( glaciers ), and wind.

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Extrusive igneous rocks cool and solidify quicker than intrusive igneous rocks.

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The Rock Cycle. Like most Earth materials, rocks are created and destroyed in cycles