what is mean basalt rock
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a dark gray to black dense to fine-grained igneous rock that consists of basic plagioclase, augite, and usually magnetite.
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Basalts are formed by rapid cooling of basaltic lava, equivalent to gabbro–norite magma, from the interior of the crust and exposed at or very close to the surface. These basalt flows are thick and extensive in which gas cavities are nearly absent
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