Igneous rocks are formed . A. when magma cools and solidifies
B. when the minerals in metamorphic rocks become calcified
C. by extreme temperatures and pressures
D. when the minerals in sedimentary rock react with acidic compounds in the ground

A. When magma cools and solidifies

Explanation: Igneous rocks form when magma cools and solidifies. This could occur on a volcano or on Earth’s surface, though it must be noted that all magma develops underground. Similar to lava, magma is molten rock that is underground. A way to remember how igneous rocks are formed is by remembering that the term is derived from the Latin word for fire, which can remind you of magma.

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