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15.3
The fossil record provides evidence of life's history
| Question | Answer |
|---|---|
| How do fossils form? | under right conditions, minerals dissolved in groundwater seep into the tissues of a dead organism and replace its organic material. The plant or animal remains become petrified- they turn to stone |
| Geologic time scale | organizes Earth's history into three distinct ages known as the Paleozoic, Mesozoic, and Cenozoic eras |
| relative dating of fossils | reflect the order in which groups if species existed compared to another |
| radiometric dating of fossils (and half life) | based on the measurement of certain radioactive isotopes in objects. Isotope's half life is the number of years it takes for 50 percent of the original sample to decay |
| continental drift (and Pangaea) | Landmasses on different plates that change position relative to each other. Pangaea is known as "all land" is all the landmasses together into one super continent |
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beakru1
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