| A | B |
|---|
| Igneous rock | rock formed from melted minerals that have cooled and hardened |
| luster | how a mineral reflects light |
| streak | color of the mark a mineral makes on a white tile |
| mineral | element or compound found in the earth |
| hardness | ability of a mineral to resist being scratched |
| magma | hot liquid rock inside the earth |
| intrusive rock | Igneous rock that forms underground from cooled magma |
| rock cycle | series of natural changes that cause one type of rock to become another type of rock |
| extrusive rock | Igneous rock that forms from cooled lava on the earth's surface |
| rock | natural solid material made of one or more minerals |
| sedimentary rock | rock formed from pieces of other rock and remains of living things that have been pressed and cemented together |
| metamorphic rock | rock that has been changed by intense heat, pressure, and chemical reaction |
