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8 Cards in this Set
- Front
- Back
Relative Age: |
The age of a rock compared to the ages of rock layers. |
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Absolute Age: |
The age of a rock given as the number of years since the rock formed. |
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Law Of Superstition: |
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: |
An igneous rock layer formed when lava flows onto Earth's surface and hardens. |
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Intrusion: |
An igneous layer formed when magma hardens beneath Earth's surface. |
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Fault: |
A break or crack in Earth's lithosphere along which the rocks move. |
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Uncomformity: |
A place where an old, eroded rock surface is in contact with a newer rock layer. |
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Index Fossil: |
Fossils of widely distributed organisms that only during one short period. |
