| A | B |
|---|
| igneous rock | formed from the crystallization of magma |
| lava | magma that flows out onto Earth's surface |
| extrusive | fine-grained igneous rocks that cool quickly on Earth's surface |
| intrusive | course-grained igneous rocks that cool slowly beneath Earth's surface |
| partial melting | process whereby some minerals melt at low temperatures while other mineral remain solid |
| felsic | light-colored rocks that have a high silica content and contain quartz and the feldspars orthoclase and plagioclase |
| mafic | dark-colored rocks that contain low amounts of silica and are rich in iron and magnesium |
| porphyritic texture | when a rock has grains of two different sizes: large well-formed crystals surrounded by finer-grained crystals of the same mineral or different minerals |
