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© US Geological Survey

A dark, fine-grained, extrusive (volcanic) igneous rock with a low silica content (40% to 50%), but rich in iron, magnesium and calcium. Basalt makes up most of the ocean floor and is the most abundant volcanic rock in the Earth's crust.
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Calcium
Crust
Earth
Igneous Rock
Iron
Magnesium
Silica
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