GEOLOGY

Detailed explanation-1: -Intrusive igneous rocks form when magma cools slowly below the Earth’s surface and solidifies. Intrusive igneous rocks like granite, gabbro, diorite, and dunite have large, well-formed crystals.

Detailed explanation-2: -Intrusive Igneous Rocks: Intrusive, or plutonic, igneous rock forms when magma is trapped deep inside the Earth.

Detailed explanation-3: -Igneous rocks that form below Earth’s surface are called intrusive. Intrusive igneous rocks form when magma, or molten rock, becomes trapped beneath the surface of the earth. It cools over the course of thousands or millions of years, crystallizing and solidifying as it cools.

Detailed explanation-4: -If the magma cools quickly, the crystals will be large (coarse grained). If the magma cools slowly, the crystals will be small (fine grained). Because igneous rocks are formed from molten rock, they do not contain fossils. Granite is an example of an intrusive igneous rock with large crystals.

Detailed explanation-5: -Intrusive igneous rocks cool from magma slowly in the crust. They have large crystals. Extrusive igneous rocks cool from lava rapidly at the surface.