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13 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 rock given as the number of years since the rock formed |
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Law of Superposition |
The geologic principle that states that in horizontal rock layers, each layer is older than the layer above it and younger than the layer below it. |
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Extrusion |
Lava that hardens on the surface
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Intrusion |
Magma that forces its way into rock and hardens |
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Fault |
A break in earths crust |
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Uncomformity |
A place where a old, eroded rock surface is in contact with a newer rock layer |
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Index Fossil |
Fossils of widely distributed organisms that lived for a short period |
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Geologic Time Scale |
A record of geologic events and life forms in earths history |
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Era |
One of the three long units of geologic time between the precamprian and the present |
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Period |
One of the units geologic time into in which are divided into eras |
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Comet |
A ball of dust and ice that orbits the sun |
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Continental Drift |
The slow movement of continents over earths surface |