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Course 3 Topic 6.1
Term | Definition |
---|---|
Relative age | The age of a rock compared to the ages of other rocks. |
Absolute age | The age of a rock given as the number of years since the rock formed. |
Law of Superposition | The geologic principle that states the in horizontal layers of sedimentary rock, each layer is older than the layer above it and younger than the layer below it |
Fossil | The preserved remains or traces of an organism that lived in the past. |
Uncomformity | A gap in the geologic record that shows where rock layers have been lost due to erosion. |