| A | B |
|---|
| Law of Original Horizontality | Rocks are deposited in horizontal layers |
| Law of Superposition | Oldest rocks are on the bottom and youngest on top |
| Law of Included Fragments | Oldest rocks are pieces inside other rocks |
| Law of Cross Cutting Realtionships | Igneous intrusions that cut through sedimentary rocks are younger than rocks they cut through |
| Unconformity | Gap in rock record |
| Sill | Horizontal igneous intrusion |
| Disconformity | Igneous rock deposited before next Sedimentary layer is layed down |
| Absolute Dating | Being able to exactly date an event in geologic history |
| Tree Rings | Method of absolute dating where each tree ring = 1 year |
| Varves | Sediments in glacial lakes showing light and dark bands that = 1 year |
| Half Life | Time it takes for radioactive element to decay |
| 5700 years | Half life of Carbon 14 |
| RadioCarbon Dating | Way to date organic material |
| Parent Material | Unstable radioactive element that decays into stable daughter material |
| 50 grams | Amount of parent material left after 1 half life if you had 100g to start with |
