| A | B |
|---|
| core | center of earth |
| crust | earth's solid outer layer |
| fossil | marks or remains of a once-living thing |
| igneous rock | rock that was once melted but has cooled and hardened |
| mantle | earth's middle layer |
| metamorphic rock | rock that has been changed by heat and pressure |
| mineral | solid natural object that has never been alive |
| rock | solid material made of one or more minerals |
| rock cycle | a process of changing rock types |
| sedimentary rock | a process of changing rock types |
| geologist | a scientist who studies the history of Earth by studying rocks |
| igneous, metamorphic, and sedimentary | three different types of rocks |
| hardness, shape, and color | three properties of minerals |
| Earth | a ball of rock with three layers |
| mold | the shape of a plant or animal left in sediments when the rock formed |
| imprint | molds of leaves or other thin objects |
| cast | froms when mud or minerals fill a mold |
| fossils | found mostly in sedimentary rocks |
| paleontologist | a scientist who studies fossils |
| sediment | pieces of rocks and soil |
