| A | B |
|---|
| Moh's Scale for Hardness | ranks a mineral's hardness from 1-10 |
| luster | how a mineral reflects light |
| streak | the color of the powder left behind by a mineral when it is scratched on a tile or plate |
| hardness | this property determines how easily a mineral scratches |
| lava | molton rock that is above the earth's surface |
| magma | molton rock that is below the earth's surface |
| metamorphic rocks | rocks that have changed completely as a result of heat and pressure |
| igneous rocks | rocks that form from molten rock |
| sedimentary rock | rock formed by layers of sediment |
| minerals | natural non-living solid crystals that make up rocks |
| sediments | eroded materials that settle on land or on the bottom of rivers, lakes, or oceans |
| weathering | a natural process such as water freezing and thawing inside the cracks of rocks causing them to break apart |
| fossils | very old remains of plant or animal life |
