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Igneous rock
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Vocab 11/30

QuestionAnswer
Igneous rock rock that forms when magma or lava cools and solidifies
Intrusive igneous rock that forms slowly from the cooling and solidification of magma beneath Earth’s surface
Extrusive igneous rock that forms quickly from the cooling and solidification of lava at Earth’s surface
Felsic describes magma or igneous rock that is rich in feldspars and silica, and is generally light in color
Mafic describes magma or igneous rock that is rich in magnesium and iron, and is generally dark in color
Basalt a dark, fine-grained igneous rock
Granite a coarse-grained igneous rock, that has obvious crystals of mica, quartz, and feldspars. Usually a mix of grey or pink, white, and black
Obsidian a glasslike volcanic rock formed by the rapid solidification of lava without crystallization
Pumice a very light and porous volcanic rock formed when a gas-rich froth of glassy lava solidifies rapidly
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