Igneous Rocks

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What are igneous rocks?

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Igneous rocks are formed from the cooling and solidification of molten rock material called magma or lava.

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What is the difference between intrusive and extrusive igneous rocks?

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Intrusive igneous rocks form from magma that cools slowly beneath the Earth's surface, while extrusive igneous rocks form from lava that cools quickly on the Earth's surface.

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What is an example of an intrusive igneous rock?

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Granite is an example of an intrusive igneous rock.

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What is an example of an extrusive igneous rock?

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Basalt is an example of an extrusive igneous rock.

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How do coarse-grained igneous rocks form?

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Coarse-grained igneous rocks form from slow cooling magma, allowing large crystals to develop.

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How do fine-grained igneous rocks form?

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Fine-grained igneous rocks form from rapidly cooling lava, resulting in small crystals.

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What is pegmatite?

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Pegmatite is a coarse-grained, intrusive igneous rock that forms from slowly cooling magma, often containing large crystals.

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What does it mean if a rock is described as 'extrusive'?

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If a rock is described as 'extrusive', it means it was formed from lava that erupted onto the Earth's surface.

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What is the cooling rate of intrusive igneous rocks?

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Intrusive igneous rocks cool slowly.

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What is the cooling rate of extrusive igneous rocks?

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Extrusive igneous rocks cool quickly.