Here's a breakdown:

* Magma: Molten rock found beneath the Earth's surface.

* Crystallization: The process where magma cools and solidifies, forming minerals with distinct crystal structures.

* Igneous rocks: Rocks formed from the cooling and solidification of magma or lava (magma that has erupted onto the Earth's surface).

There are two main types of igneous rocks, depending on where the magma cools:

* Intrusive igneous rocks: Formed when magma cools slowly beneath the Earth's surface. These rocks have larger crystals due to the slow cooling process. Examples include granite and gabbro.

* Extrusive igneous rocks: Formed when lava cools quickly on the Earth's surface. These rocks have smaller crystals or may even be glassy due to the rapid cooling. Examples include basalt and obsidian.