| A | B |
|---|
| coal | a fossil fuel made of decayed and compressed plant material |
| fossil fuel | examples include coal, petroleum, and natrual gas |
| fossils | remains of plants or animals imbeded in rock |
| hardness | a characteristic of a mineral - what it will scratch or be scratched by |
| igneous rocks | formed from cooled magma |
| luster | how a mineral reflects light |
| magma | molten rock inside the earth's crust |
| metamorphic rock | fromed from other rock that has gone under great heat and pressure |
| mineral | naturally occuring crystal solid |
| rock cycle | the way rocks changes from one type to another and the processes by which the changes take place |
| rocks | combinations of one or more minerals |
| sedimentary rocks | fromed from sediment that is compressed and cemented together |
| streak | the powder a mineral leaves on a porcelin plate |
