I WONDER - Are There Different Types Of Igneous Rocks?

The video tutorial explains the two types of igneous rocks: intrusive and extrusive. Intrusive igneous rocks form when magma cools and solidifies below the Earth's surface, resulting in coarse-grained rocks with visible crystals, known as plutons. Extrusive igneous rocks form when lava cools and solidifies on the Earth's surface, creating fine-grained volcanic rocks with small or no crystals.

What is the process by which extrusive igneous rocks form?

What are the characteristics of extrusive igneous rocks?