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Science 2
| Question | Answer |
|---|---|
| Rock | Mixture of such minerals,rock fragments, volcanic glass,organic matter,or other natural materials |
| Rock cycle | illustrates the process that creates and changes rocks |
| Igneous rock | magma cooled and hardened |
| lava | When magma reaches earth's surface |
| Extrusive | Lava cools on the surface of earth |
| Basaltic | dense, dark colored igneous rocks that dorm from mama rich in iron and magnesium |
| Granite | Light colored rocks of a lower density than basaltic rocks |
| Metamorphic rocks | Rocks that have changed because of changes in the temperature and pressure or the presence of hot, watery fluids |
| Foilated | When mineral grains line up in parallel layers |
| Nonfoilated | Metamorphic rocks with no layers |
| Sediment | Loose materials such as rock fragments, mineral grains,and bits of shells |
| Sedimentary rocks | Forms when sediments are pressed and cemented together |
| Compaction | When small sediments push up against each other and dorm solid rock |
| Cementation | When large sediments stick together because of weathering |
| 3 types of rocks | Igneous, sedimentary,metamorphic |
| Source of igneous rocks | Magma |
| Magma | molten material below the earth's surface |
| Intrusive | Cooling of magma to form mineral grains that grow together to form solid rock below the earth's surface |
| Common intrusive igneous rocks | Gabbro,diorite,granite |
| Andesite | Higher density than granitic rocks but lower density than basaltic rocks |
| Weathering | The physical or chemical breakdown of existing rock |