| A | B |
|---|
| Igneous rocks forms when this happens | hot magma cools and hardens to form rocks |
| Why is magma forced to the surface? | magma is less dense than the surrounding rock |
| Intrusive | type of igneous rock that has large crystals because the magma cooled slowly |
| Where do intrusive rocks form? | under the earth's surface |
| Extrusive | type of igneous rock that has small crystals because magma cooled quickly |
| Outside | where do extrusive rocks form? |
| Volcanic glass | rocks that cool so quickly that no or few minerals form |
| Two ways to classify igneous rocks | where they are formed and what type of magma they form from |
| Basalt | type of magma makes dark rocks in color and have very thin fluid like magma |
| Granitic rocks | type of magma makes light colored rocks and has very thick magma |
| Andestic | type of magma that is between granitic and basaltic |
| Granitic | type of magma makes up granite |
| Basaltic | type of magma makes up basalt |
