| A | B |
|---|
| Igneous rocks | when magma or lava cools and solidifies |
| types of igneous rocks | intrusive and extrusive |
| intrusive | Takes a long time to cool; large crystals; forms inside the earth |
| extrusive | takes a short time to cool; small or no crystals; forms on the earth's surface |
| types of texture | glassy, fine-grained, coarse-grained, porhyritic |
| fine-grained | basalt; need to use a microscope to see the small crystals |
| porphyritic | has large crystals scattered on smaller crystals, large crystals on fine crystal background |
| coarse grained | rocks with large crystals. Slow cooling gives crystals enough time to grow to easily seen sizes. |
| lava | molten rock (magma) that is out |
| magma | hot liquid rock beneath the earth's surface |
| crystal | solid formed froma repeating patterns of atoms |
