igneous rock
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Igneous rock is one of the three main types of rock on Earth, formed when magma (molten rock beneath the surface) or lava (molten rock that erupts onto the surface) cools and hardens. These rocks are important because they make up much of Earth's crust and can tell us about the planet's internal processes and geological history.
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Geologic provinces of the world (USGS)
Igneous rock (igneous from Latin igneus 'fiery'), or magmatic rock, is one of the three main rock types, the others being sedimentary and metamorphic. Igneous rocks are formed through the cooling and solidification of magma or lava.