| A | B |
|---|
| minerals | inorganic, solid materials found in nature |
| rocks | made up of two or more minerals |
| crystals | solid materials that have an orderly pattern of atoms |
| cleavage | the way a mineral splits into pieces with smooth, regular planes that reflect light |
| fracture | the way that minerals that break into pieces with jagged or rough edges |
| luster | how much a mineral shines |
| gem | minerals that are rare and can be cut and polished |
| ore | a mineral that contains enough of a useful substance that it can be sold for a profit |
| Igneous Rock | forms when melted rock material from inside Earth cools |
| Sedimentary Rock | formed when sediment collects in layers to form rocks |
| Metamorphic Rock | new rock that is formed from old rock when it is heated or squeezed but not melted |
| Rock Cycle | a model that shows how rocks are changed from one form to another |
