Igneous Rocks

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What are igneous rocks?

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Igneous rocks are formed from the solidification of molten rock material (magma or lava).

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What are the two main types of igneous rocks?

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The two main types of igneous rocks are extrusive (formed from lava on the Earth's surface) and intrusive (formed from magma beneath the Earth's surface).

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How do extrusive igneous rocks form?

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Extrusive igneous rocks form from lava that erupted onto Earth's surface.

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How do intrusive igneous rocks form?

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Intrusive igneous rocks form from magma that cools and solidifies beneath the Earth's surface.

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What is the texture of igneous rocks?

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The texture of igneous rocks refers to the size, shape, and arrangement of the crystals within the rock.

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How are igneous rocks classified?

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Igneous rocks are classified based on their origin, texture, and mineral composition.

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What is the difference between fine-grained and coarse-grained igneous rocks?

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Fine-grained igneous rocks have small crystals due to rapid cooling, while coarse-grained igneous rocks have larger crystals due to slower cooling.

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What is porphyry?

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Porphyry is an igneous rock that has a mixed texture, with larger crystals (phenocrysts) embedded in a finer-grained matrix.

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What does it mean if an igneous rock is described as coarse-grained?

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A coarse-grained igneous rock has large crystals, indicating it cooled slowly beneath the Earth's surface.

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What is diorite?

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Diorite is an intrusive igneous rock that is characterized by its coarse-grained texture and is composed mainly of plagioclase feldspar and other minerals.