The three main types of rocks and how they are formed

types of extrusive igneous rocks:

andesite, basalt, obsidian, pumice, rhyolite, scoria, and tuff

types of intrusive igneous rocks:

diorite,gabbro, granite, pegmatite and peridotite

sedimentary rock

formed from particles of sand,shells, pebbles and other fragments of material gradually all of this sediment turns into a rock

metamorphic rock

formed under the surface of the earth from the change of that occurs due to intense heat and pressure

igneous rocks

formed when magma ( molten rock deep within the earth) cools and hardens sometimes the magma inside the earth

types of metamorphic rocks:

gneiss, marble, quartzite, and slate

types of sedimentary rocks:

shale, sandstone, limestone, rock salt