| A | B |
|---|
| igneous rock | rock formed from cooled and hardened magma |
| sedimentary rock | rock formed from hardened deposits of sediments |
| metamorphic rock | rock formed from other rocks as a result of intense heat, pressure, or chemical processes |
| intrusive igneous rocks | rocks formed from the cooling of magma beneath the earth's surface |
| extrusive igneous rocks | rocks formed from molten lava that hardens on the earth's surface |
| Granite, Basalt, Diorite | Geologists have grouped igneous rocks into these families |
| clastic sedimentary rock | rocks made up of fragments from pre-existing rocks |
| chemical sedimentary rock | rock formed from minerals that have been dissolved in water |
| organic sedimentary rock | rock formed from the remains of organisms |
| stratification | cross-bedding and graded bedding are types of this |
| contact metamorphism | When hot magma pushes through existing rock, the heat from the magma can change the structure and mineral composition of the surrounding rock. |
| regional metamorphism | rocks over large areas are effected during periods of tectonic activity |
| foliated metamorphic rocks | rocks with visible bands |
| unfoliated metamorphic rocks | rocks that do not have bands of crystals |
| Obsidian | type of igneous rock that usually appears black but is found on the light side of the color chart in the reference table for igneous rock identification |
