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4 Cards in this Set
- Front
- Back
Relative age |
Definition: The age of a rock compared to the ages of rock layers. |
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Absolute age |
Definition: The age of a rock given as the number of years since the rock formed. |
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Law of Superposition |
Definition: The geologic principle that states that in horizontal layers of sedimentary rock, each layer is older than the layer above it and younger than the layer below it. |
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Extrusion |
Definition: An igneous rock layer formed when lava flows onto Earth's surface and hardens. |