Here's why:
* Intrusive means that the rock formed underground.
* Igneous means the rock formed from cooled and solidified magma or lava.
Examples of intrusive igneous rocks:
* Granite: A very common and hard rock often used in construction.
* Gabbro: A dark-colored rock found in oceanic crust.
* Diorite: A medium-gray rock with a mix of light and dark minerals.
The rate at which magma cools influences the size and arrangement of crystals in the resulting rock. Intrusive rocks, formed deep within the Earth, cool slowly, resulting in larger crystals.
