Granite doesn't form directly from heat and pressure alone. It forms from the cooling and crystallization of magma deep within the Earth.

Here's the breakdown:

1. Magma: Molten rock beneath the Earth's surface.

2. Heat and Pressure: Heat and pressure play a crucial role in the formation of magma. They cause existing rocks to melt.

3. Cooling and Crystallization: As magma rises towards the surface or cools within the Earth, it starts to solidify. This process is called crystallization, where minerals form within the cooling magma.

4. Granite: When the magma cools slowly and crystallizes, it forms a coarse-grained igneous rock called granite.

So, while heat and pressure are involved in the formation of granite, the key ingredient is magma that cools and crystallizes.