| A | B |
|---|
| Igneous Rocks | rocks that form by the cooling of magma or lava |
| Basalt | fine grained igneous rocks that make up most of the oceanic crust |
| Course-grained | rocks that are made of larger sized crystals |
| Lava | molten rocks when they are on the EarthÂ’s surface |
| Extrusive | igneous rocks that form on the surface of the Earth |
| Felsic | igneous rocks that are light-colored, high silica content, and contain quartz, and feldspar |
| Fine-grained | rocks that are made of small sized crystals |
| Granite | course grained igneous rock made of feldspars and quartz minerals that makes up most of the continental crust |
| Intrusive | igneous rocks that form inside of the Earth |
| Kimberlite | ultramafic rocks that contain diamonds |
| Obsidian | a quick cooling-glassy igneous rock that has no visible crystals |
| Porphyritic | large crystal surrounded by smaller fine grained crystals |
| Pumice | a light-colored porous form of an igneous that is used as an abrasive |
| Ultramafic | igneous rocks with low silica content and a very high levels of iron and magnesium |
