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8 Cards in this Set
- Front
- Back
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relative age |
the age of the rock compare to the ages of the rock layers
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absolute age |
the age of the rock given as the number of years since the rock was formed |
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law of superposition |
the geologic principle that states that the horizontal of sedimentary rock each layer is older than the layer above it and younger than the one below it |
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extrusion
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an igneous rock layer formed when lava flows onto the earth surface then hardens
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intrusion |
a igneous rock layer formed when magma hardens beneath the earths surface
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fault
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a break or crack in earth's lithosphere along which the rocks move
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unconformity
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a place where an old eroded surface is in contact with a newer rock layer |
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index fossil
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fossil of widely distributed organism that lived for only one short period
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