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According to genesis, rocks are classified into three categories, igneous rocks, sedimentary rocks, and metamorphic rocks.
Igneous rocks are formed by means of cooling and solidification of magma.
Volcanic eruptions are typical example of on-going igneous rock formation process.
Igneous rocks are formed directly from magma, therefore are classified to be primary rocks.
The energy to form igneous rocks is the heat of Earth's interior.
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