Igneous Rocks:
* Granite: Formed by the cooling and solidification of magma.
* Basalt: Formed from volcanic lava flows.
* Obsidian: A volcanic glass formed when lava cools rapidly.
* Pumice: A light, porous volcanic rock formed by trapped gas bubbles.
Sedimentary Rocks:
* Sandstone: Formed from cemented sand grains.
* Limestone: Formed from the accumulation of marine organism shells.
* Shale: Formed from compacted clay.
* Conglomerate: Formed from cemented gravel.
Other:
* Diamonds: Crystalline carbon formed under intense pressure and heat, but not due to the metamorphic process.
* Coal: Formed from the accumulation of plant matter.
* Marble: Although marble is a metamorphic rock, a raw block of limestone before it is metamorphosed is not.
Remember: Metamorphic rocks form when existing rocks are subjected to heat, pressure, or chemical reactions. Any rock that didn't experience these processes is not a metamorphic rock.
