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Basalt is an extrusive igneous rock, which means it has solidified from magma above ground. It is a mafic rock, meaning that it is relatively high in heavier element content, particularly magnesium and iron. Compared to felsic extrusive igneous rocks, like rhyolite, basalt is heavier and darker. Because of rapid cooling, basalt is composed of smaller crystals. Color ranges from greenish-black to black.
Both are igneous rock.

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15y ago

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