| A | B |
|---|
| erosion | the movement of weathered rock pieces from one place to another |
| hardness | a mineral's ability to resist being scratched |
| igneous rock | rocks that form when melted rock hardens |
| luster | the way the surface of a mineral reflects light |
| metamorphic rocks | rocks that have been changed by high heat or very high pressure |
| mineral | a solid material, formed in nature, with particles arranged in a repeated pattern |
| rock | a material made up on one or more minerals |
| rock cycle | the changes rocks go through as they change back and forth from igneous to sedimentary to metamorphic rock |
| sedimentary rocks | rocks that form when layers of rock particles are squeezed or stuck together |
| streak | the color of powder left behind when you rub a mineral against a white tile |
| weathering | the breaking down of rocks by wind, water, ice, and plant roots |
