Here's why:
* Igneous rocks are formed from the cooling and solidification of magma (molten rock) or lava (molten rock that has erupted onto the Earth's surface).
* Plutonic rocks are formed when magma cools and crystallizes slowly beneath the Earth's surface. This slow cooling allows for the formation of large mineral crystals, giving plutonic rocks a coarse-grained texture.
Examples of plutonic rocks include:
* Granite
* Gabbro
* Diorite
Volcanic rocks, on the other hand, are formed from the cooling and solidification of lava on the Earth's surface. They have a finer-grained texture because the lava cools more quickly.
