| Term | Definition |
|---|
| carbonaceous film | carbon deposit |
| relative age | approximate age |
| fossil | remains of a once living organism |
| radio activity | breakdown of unstable isotopes into stable atoms |
| mold | imprint of a once living organism |
| isotope | variation in number of neutrons |
| original remains | amber of frozen animals |
| petrified remains | remains replaced by minerals |
| law of superposition | oldest rock layers are under younger ones |
| cast | sediments fill a mold |
| half-life | amount of time for half of a substance to breakdown |
| trace fossil | footprints or animal tracks |
| fossil fuels | natural gas, oil and coal |
| index fossil | organism that lived in a wide area for a short period of time |
| absolute age | exact age |
Combine with other sets
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