Igneous Rocks ESRT

Front

What is an igneous rock?

Back

An igneous rock is formed from the solidification of molten material called magma or lava.

Front

What are the two main types of igneous rocks?

Back

Intrusive (plutonic) and extrusive (volcanic) rocks.

Front

How are intrusive igneous rocks formed?

Back

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

Front

How are extrusive igneous rocks formed?

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Extrusive igneous rocks are formed from lava that cools and solidifies quickly on the Earth's surface.

Front

What is the difference between mafic and felsic igneous rocks?

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Mafic rocks are rich in magnesium and iron, are darker in color, and have a higher density. Felsic rocks are rich in silica, are lighter in color, and have a lower density.

Front

What is a vesicular igneous rock?

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A vesicular igneous rock is an extrusive rock that contains gas bubbles, giving it a porous texture.

Front

What is the texture of granite?

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Granite has a coarse-grained texture due to the slow cooling of magma, allowing large crystals to form.

Front

What is the texture of basalt?

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Basalt has a fine-grained texture because it cools quickly, resulting in small crystals.

Front

What is rhyolite?

Back

Rhyolite is an extrusive igneous rock that is felsic in composition, light in color, and has a fine-grained texture.

Front

What is the process of solidification in igneous rock formation?

Back

Solidification is the process where magma or lava cools and crystallizes to form solid rock.