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the worlds history -
Earth's history. (earth-science)
| Question | Answer |
|---|---|
| Uni-Formitarianism | Today's geologic process (such as weathering process, erosion, volcanoes, earthquakes, etc.) Also took place in the past. |
| Relative age | Comparing a rock's age to another rock based on its location in rock layers. |
| Absolute Age | The actual age (#)of a fossil |
| Original Horizontality | Sediments settle with horizontal layers that are parallel to the ground |
| Super-Position | Oldest rock layer is at bottom and each layer above is the youngest. |
| Igneous Intrusion | When Magma is forced upward into rocks. |
| Precambrian Eon | 85% of earth's history; no fossil record; earth's formation. |
| Paleozoic Era | 8.5% of earth's history several plant and animal species evolve. |
| Mesozoic Era | 3.5 of earth's history several dinosaurs and birds evolve. |
| Cenozoic Era | 1.4% of earth's history mammals (humans) evolve. |
| Radioactive decay | Nuclei of atoms break apart of long periods of time. |
| Half life | The # of years needed for the half the locations to decay; 50%->25%->12.5%->6.25->3.125% |
Created by:
Umiik
on 2009-04-07