Identify the following igneous rock. It has fine grain size and is extrusive.

Granite

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Pumice

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Both a and b

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None of the above

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Solution

The correct option is D None of the above
None of the above

Extrusive igneous rocks erupt onto the surface, where they cool quickly to form small crystals. Some cool so quickly that they form an amorphous glass. These rocks include andesite, basalt, obsidian, pumice, rhyolite, scoria, and tuff.

Andesite is a fine-grained, extrusive igneous rock composed mainly of plagioclase with other minerals such as hornblende, pyroxene, and biotite.

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