Sedimentary, Igneous, and metamorphic. Sedimentary rocks are formed from particles of sand, shells, and pebbles, which make up conglomerate and limestone. Igneous Rocks are formed from heat and pressure from being underground for a long time, which makes up Gneiss and marble. Metamorphic Rocks are formed when magma cools off and hardens, making Basalt and Obsidian.
