Intrusive igneous rock exhibits crystals that are visible without magnification.
Igneous rock (IG nee us). Word for fire. It starts to cool and turns into solid igneous rock.
All igneous rocks do not cool the same way. Look all the same. Some cool slowly, deep under the earth's surface.
These are called intrusive igneous rocks. With large crystals. Granite is an example of a rock that cooled slowly and has large crystals.
Magma is called lava when it reaches the earth's surface. Lava cools quickly and forms rocks with small crystals. They are called extrusive igneous rocks.
Type of rock. Below is a summary of the major characteristics of igneous rocks.
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