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How do fine grained igneous rocks form?

Question:

How do fine grained igneous rocks form?

One of Two Igneous Rock Types:

Igneous rocks are those types of rocks that form from cooled molten rock, or magma. Igneous rocks can have large, coarse mineral and crystal grains, or fine, small ones. There are two types of igneous rock based on how they're formed. Intrusive igneous rocks form underground, while extrusive igneous rocks form above Earth's surface.

Answer and Explanation:

Fine grained igneous rocks are called extrusive, due to the process by which they're formed. Extrusive igneous rocks form as a result of a volcanic...

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Volcanic vs Plutonic Igneous Rocks: Definition and Differences

from Earth Science 101: Earth Science

Chapter 7 / Lesson 2
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