| A | B |
|---|
| rock | A hard substance composed of one or more minerals or minerallike substances. |
| igneous | Formed from molten rock. |
| sedimentary | Formed by the compacting and cementing of sediments or by other non-igneous processes at the Earth's surface. |
| sediment | Particles of rocks or organic materials that have been carried along and deposited by water and/or wind. |
| metamorphic | Changed in form as a result of chemical reactions, heat and/or pressure. |
| rock cycle | The interrelated processes that cause the continuos changing of rocks from one kind to another. |
| extrusive rock | An igneous rock formed from lava and crystallized at the surface of the Earth. |
| intrusive rock | An igneous rock formed from magma. |
| clastic rock | A sedimentary rock formed from the fragments of previously existing rock. |
| organic rock | A sedimentary rock that is formed either directly or indirectly from material that was once alive. |
| chemical rock | A non-clastic sedimentary rock formed by inorganic processes such as evaporation. |
| metamorphism | The process in which metamorphic rock is formed. |
