The three main types of rocks and how they are formed
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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
