Here's why:

* Formation: Granite is an igneous rock, meaning it forms from the cooling and solidification of magma (molten rock) beneath the Earth's surface.

* Slow Cooling: Magma deep underground cools very slowly, giving the minerals time to grow large crystals. This is why granite has a coarse-grained texture with visible mineral grains.

* Intrusive Rocks: Granite is classified as an intrusive igneous rock because it cools slowly within the Earth's crust.

In contrast, volcanic rocks like basalt cool quickly on the Earth's surface and have a fine-grained or glassy texture.