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r/a dating + fossils
Question | Answer |
---|---|
principle of superposition | as sediments begin to form layers, the oldest material goes to the bottom and the youngest go to the top |
law of cross cutting relations | any changes to the rock layers must be YOUNGER than the layer it cuts through |
fossil correlation | layers of rock being compared using fossils, if rocks have the same fossils, they were formed around the same time in the same place |
fossil | the remains of a once existing organism |
uniformitarianism | all natural laws and processes are the same in the universe |
index fossils | fossils used to estimate absolute age of a rock layer |
unconformity | any change or "missing piece" in a rock layer |