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