| A | B |
|---|
| anomalous sample | Sample tested by the radiocarbon dating method that gives a wrong date |
| carbon 14 | radioactive isotope of cabon used in the radiocarbon dating mathod for determining the age of organic remains |
| core | Innermost part of the sun where thermonuclear reactions generate energy, lies below the the mantle |
| crust | solid outer portion of earth |
| discontinuity | boundary between two layers of the earth below the crust where earthquake waves change speed |
| fossil graveyard | assortment of fossils embedded in hardened sediment, evidently the result of a catastrophe |
| geology | study of the earth's structures and processes |
| historical geology | branch of geology that deals with the history of the earth |
| mantle | portion of the earth's interior lying between the crust and the core |
| Mohorovicic dicontinuity | Boundary between the earth's crust and mantle, varies from 3 mi. to 37 mi. |
| radioactive | giving off of particles or radiation from the nucleus of an atom |
| strata | Layers of sedimentary rock, usually horizontal |
| uniformitarianism | Doctrine that "the present is key to the past" and that geological change is caused by gradual processes rather than sudden catastrophes |
