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chapter 10 vocab
| Term | Definition |
|---|---|
| fossils | are the preserved remains or evidence of ancient living things |
| catastrophism | is the idea that conditions and organisms on earth change in quick, violent events |
| uniformitarianism | states that geologic processes that occur today are similar to those that have occurred in the past |
| carbon film | the fossilized carbon outline of an organism or part of an organism |
| mold | the impression in a rock left by a ancient organism |
| cast | a fossil copy of an organism made when a mold of the organism is filled with sediment or mineral deposits |
| paleotologists | scientists who study fossil |
| relative age | the age of rocks and geologic features compared with other rocks and features nearby |
| superposition | the principle that in undisturbed rock layers, the oldest rocks are at the bottom |
| inclusion | a piece of an older rock that becomes part of a new rock |
| unconformity | a surface where a rock had eroded away, producing a break or gap, in the rock record |
| correlation | matching rocks and fossils from separate locations |
| index fossils | represent species that existed on earth for a short length of time, were abundant, and inhabited many locations |
| absolute age | to mean the numerical age, in years, of a rock or object |
| isotopes | are atoms of the same element that have different numbers of neutrons |
| radioactive decay | the process by which an unstable element naturally changes into another element that is stable |
| half-life | the time required for half of the parent isotopes to decay into daughter isotopes |
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