Final answer:
Igneous rocks are classified by composition and color based on the minerals present in the rocks.
Explanation:
Igneous rocks are classified based on their composition and color. The presence of specific minerals in the rocks determines their color. For example, a rock with olivine will be green (ultramafic), those with ferromagnesian minerals will be dark (mafic), and those with nonferromagnesian minerals will be light (felsic).
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