| A | B |
|---|
| igneous rock | form when melted rock from inside earth cools. |
| extrusive igneous rock | melted rock that cools on Earth's surface |
| intrusive igneous rock | melted rock that cools below Earth's surface |
| granite | light color igneous rock |
| basaltic | dark colored igneous rock |
| obsidian | volcanic glass |
| fissure | crack in Earth's crust |
| magma | underground melted rock |
| What is the main difference between intrusive and extrusive igneous rock? | Incrusive rocks have large crystals that are easy to see, but extrusive rocks have small crystals that are difficult to see. |
| sedimentary rock | pieces of broken rock, shells and mineral grains |
