Three Types of Rocks:
1. Igneous Rocks: Formed from cooled magma or lava, examples include granite, basalt, and obsidian.

2. Sedimentary Rocks: Formed from the compaction and cementation of sediments, examples include sandstone, limestone, and shale.

3. Metamorphic Rocks: Created from the alteration of existing rocks due to heat and pressure, examples include marble, slate, and quartzite.

These rock types exhibit diverse characteristics and formations, reflecting distinct geological processes in their creation.