Granite, pumice, and basalt are all igneous rocks. Igneous rocks are formed when magma or lava cools and solidifies. Magma is molten rock that is found beneath the Earth's surface, while lava is molten rock that has reached the Earth's surface.

Granite is a coarse-grained igneous rock that is formed when magma cools slowly beneath the Earth's surface. It is composed of quartz, feldspar, and mica.

Pumice is a lightweight, frothy igneous rock that is formed when magma cools quickly on the Earth's surface. It is composed of tiny bubbles of gas that were trapped in the magma as it cooled.

Basalt is a dark, fine-grained igneous rock that is formed when magma cools quickly on the Earth's surface. It is composed of pyroxene, plagioclase feldspar, and olivine.