| A | B |
|---|
| mineral | a natural solid substance found in the earth's crust |
| ore | a useful mineral that is removed from the earth and sold for profit |
| luster | the way light reflects from a mineral's surface |
| streak | color of the powdered mineral |
| crust | outer layer of the earth made mostly of rock |
| rock | a solid that is made of one or more minerals |
| mantle | layer just beneath the crust |
| core | layer at the earth's center |
| igneous | rock formed from melted rock that has cooled and hardened |
| sedimentary | hardened bits of rocks or minerals, shells and plants or animal remains |
| metamorphic | rocks changed by heat and pressure |
| magma | melted rock |
| lava | magma that reaches the earth's surface |
| conglomerate | sedimentary rock fromed from bits of rock the size of gravel |
| sandstone | sedinentary rock made of sand-sized bits of rock |
| shale | sedimentary rock bade from bits that are too small that you cannot see them |
| coal | sedmentary rock formed from plants that lived long ago |
| limestone | sedimentary rock made from shells and other remains of plants and animals that lived in the ocean |
| fossil | the remains or traces of living things preserved in rock |
