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8 Cards in this Set
- Front
- Back
Flash Card 1: Relative Age |
The age of a rock compared to the ages of rock layers. |
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Flash Card 2: Absolute Age |
The age of a rock given as the number of years since the rock formed.
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Flash Card 3: Law Of Superposition |
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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Flash Card 4: Extrusion |
An igneous rock layer formed when lava flows onto Earth's surface and hardens.
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Flash Card 5: Intrusion
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An igneous rock layer formed when magma hardens beneath Earth's surface.
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Flash Card 6: Fault |
A break or crack in Earth's lithosphere along which the rocks move.
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Flash Card 7: Uncomformity |
A place where an old, eroded rock surface is in contact with a newer rock layer.
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Flash Card 8: Index Fossil |
Fossils of widely distributed organisms that lived during only one short period.
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