Question

How do intrusive rocks form?

Lava cools slowly outside a volcano.
Magma cools slowly inside the Earth.
Molten material is cooled quickly by water.
Magma is ejected into the air and cools slowly.

Answer 1

Intrusive rocks form when magma cools slowly inside the Earth. This slow cooling allows large crystals to form within the rock, resulting in a coarse-grained texture. In contrast, extrusive rocks are formed from lava that cools quickly outside a volcano, leading to a fine-grained texture. Therefore, the correct statement regarding the formation of intrusive rocks is:

**Magma cools slowly inside the Earth.**