| A | B |
|---|
| Precambrian | 1st time period |
| Paleozoic | Appalachian Mts. formed |
| Mesozoic | Dinosaurs walked the earth |
| Cenozoic | Time period in now |
| Chemical change | Changes minerals in rocks |
| Deposition | Dropping of sediment |
| Igneous rock | Made from cooling and hardening of magma |
| Sedimentary rock | Pressed layers with water |
| Metamorphic rock | Heat and Pressure |
| Physical change | Changes shape and size of rock |
| Sediment | A weathered bit of rock |
| Runoff | Water that washes away soil |
| Rock cycle | Rocks changing to different type |
| Crust | Layer that we stand on |
| Asthenosphere | Liquid la;yer under crust |
| Mantle | Thick layer of solid rock |
| Outer core | Melted iron and nickel |
| Inner core | Solid iron and nickel |
| Normal fault | Plates pulling away |
| Reverse fault | Plates hitting each other |
| Strike-skip fault | Plates sliding past each other |
| Seismograph | Measures strength of earthquake |
| Richter scale | 1-10 |
| Mercalli scale | I-XII |
| Primary waves | First waves |
| Secondary waves | Move side to side |
| Large waves | Last waves felt |
