Igneous Rocks

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What are Mafic rocks?

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Mafic rocks are igneous rocks that are dark in color and rich in magnesium and iron.

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What are Felsic rocks?

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Felsic rocks are igneous rocks that are light in color and rich in silica.

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What does Vesicular mean in geology?

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Vesicular means that the rock is full of air bubbles, indicating gas was trapped during solidification.

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How do igneous rocks form?

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Igneous rocks form when molten (melted) rock cools and solidifies.

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What does fine-grained mean in the context of igneous rocks?

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Fine-grained means the rock has little to no visible crystals, indicating rapid cooling.

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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 intrusive (plutonic) and extrusive (volcanic).

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What is an example of a mafic rock?

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An example of a mafic rock is basalt.

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What is an example of a felsic rock?

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An example of a felsic rock is granite.

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What is the texture of a rock that cools slowly underground?

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The texture of a rock that cools slowly underground is coarse-grained, with large visible crystals.

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What is the difference between intrusive and extrusive igneous rocks?

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