| A | B |
|---|
| Igneous rocks | These rocks were originally hot, fluid magma within the earth. |
| Sedimentry rocks | These rocks are formed from parcticles that have been carried along and deposited by wind and water. |
| Metamorphic rocks | These rocks are formed when chemical reactions,tremendous heat , and/or great pressure change existing rocks into new kinds of rocks. |
| Rock cycle | The continuous changing of rocks from one kind to another over long periods of time. |
| Fine- grained rocks | These rocks are made of interlocking mineral crystals. |
| Obsidian | Also known as volcanic glass(has a glassy texture). |
| Basalt | A dark gray rock that has a fine-grained texture. |
| Coarse - grained rocks | Crystals in some igneous rocks that are visible to the unaided eye. |
| Porphyrictic rocks | Rocks that consist of large crystals scattered on a background of much smaller crystals. |
| Extrusive Rocks | Rocks that are formed from lava and are also known as volanic rocks. |
| Instrusive Rocks | Igneous rocks that are formed deep within the earth. |
| Plutonic Rocks | The name of these rocks are another name for an instursive rock. |
| Clastic rocks | Sedimentry rocks that are made of fragments of previouly existing rocks. |
| Conglomerate Rocks | A rock in which a third of it was made from pebbles. |
| Organic Rocks | Rocks that are made from organisms. |
| Chemical rocks | Rocks that are formed when a sea or a lake dries up, leaving large amounts of minerals that were dissolved in water. |
| Metamorphism | The changing of one type of rock into another as a result of heat, pressure, and/or chemical reactions. |
| Slate | A metamorphic rock changed from Shale. |
| Gneiss | A metamorphic rock changed from a granite rock. |
| foliated | A group of metamorphic rocks in which the mineral crystals are arranged in parallel layers,(or bands). |
