| A | B |
|---|
| Uniformitarianism | Process today that are the same as they where along time ago |
| Law of superposition | youngest rock layers on top; oldest rock layers on the bottom |
| Original Horizontality | Sedimentary rocks are deposited in horizontal layers |
| Igneous Intrusion | Hot Liquid Rocks squeezes through all the other layers of rock |
| Igneous extrusion | liquid rock squeezes through all the other layers of rock and out to the surface |
| Fold | Crustal movement squeezes rock layers into curved layers |
| Recumbent Fold | A fold Folds over on top of itself & puts younger layers under the older rock layers |
| Fault | a break in the curst where movement occurs |
| Offset Layers | Layers on opposite sides of a fault DO NOT line up |
| Contact Metamorphism | Rocks change from the heat of an igneous intrusion |
| eon | Large division of time |
| era | Subdivision of eon |
| epoch | Subdivision of a period |
| period | Subdivision of an era |
| Precambrian/Phanerozoic | The 2 major eons |
| Cenozoic | most recent era; means era of "most recent animals" |
| Mesozoic | "age of reptiles"; middle era |
| Paleozoic | era of the "ancient animals" |
| Correlation | matching |
| Index Fossils | wide spread & short lived ( an animal lived all over the world but for a short amount of geologic time) |
| Unconformity | Buried erosional surface; place where erosion has wiped out one or more layers |
| Submergence/Depostition | Time when land is under water & sediments are being left in horizontal layers |
| Uplift/Erosion | Time when land is not covered by water & weathering agents are wearing away the land//creats unconformity |
| Radioactive Dating | Using radioactive istope half-lives to tell you how old something is |
| Carbon-14 | Used to date once living things less than 50,000 years old |
| Nitrogen-14 | A decay product of C-14 |
