| geology | the study of the earth and its structers and processes |
| crust | thinest layer and coolest layer of the earth |
| seismologist | a geologist who studys the earthquakes |
| mantle | dencer than the core |
| core | center of the earth and mostly composed of liquid iron |
| historical geology | that branch of geology tha5t deals with the origin and history of the earth's structure, materials, and process |
| organic | In mineral, describes materials that are obtined from living or once - lliving organisms |
| sediment | settles out of the water |
| strata | sedemenary lawyers of the earths crust |
| fossil graveyard | argument against the doctrin of uniformity |
| radioactive | emits nuclear radiation |
| decay | in a radaioactive eliment into a different radioactive element or a non radioactive element |
| carbon-14 | determins age of organic matter |
| dendrochronology | determins age by counting tree rings |
| deep time | cold earth view of the earths history |