define and classify the igneous rocks and its subtypes according to their mode of origin. give examples
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Igneous rocks (from the Latin word for fire) form when hot, molten rock crystallizes and solidifies.
Igneous rocks are divided into two groups, intrusive or extrusive, depending upon where the molten rock solidifies.
Igneous rocks are classified into four categories, based on either their chemistry or their mineral composition: felsic, intermediate, mafic, and ultramafic.
examples: Granite and Basalt
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