| A | B |
|---|
| core | the inner layer of the earth |
| crust | the layer of the earth we live on |
| mantle | the middle layer of the earth |
| metamorphic rock | a rock formed from other rocks that have been changed |
| igneous rock | a rock formed from melted rock |
| sedimentary rock | a rock formed from sediment |
| magma | melted rock within the earth |
| fossil | a trace of a plant or animal found in sedimentary rock |
| minerals | a pure solid material found in the earth's crust |
| cast fossil | a rock with the exact shape of the original plant or animal |
| mold fossil | the empty space in a sedimentary rock where a plant or animal once was |
| sediment | a material such as mud, sand or gravel |
