Question

5. Differentiate between extrusive igneous rock and intrusive igneous rock. (all differences)​

Answer 1

Intrusive igneous rocks cool from magma slowly because they are buried beneath the surface, so they have large crystals. Extrusive igneous rocks cool from lava rapidly because they form at the surface, so they have small crystals.

Answer 2

Extrusive igneous rocks are formed by the cooling of molten magma within the earth's crust.

Intrusive igneous rocks are formed when the magna solidifies within the earth's surface