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