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4 Cards in this Set
- Front
- Back
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Intrusion- An igneous rock layer formed when magma hardens beneath earth's surface. |
Extrusion- An igneous rock layer formed when lava flows onto earth's surface. |
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Superposition- Layers on the bottom are older than the layers above them. |
Half-Life- Then length of time that it takes for half of the atoms in a radioactive element to change form unstable into another form. |
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Uniformitarianism- A place where an old, eroded rock surface is in contact with a newer rock layer. |
Relative Age- Age of event or object in relation to other events or objects. |
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Absolute Age- Actual age of an event or object. |
Index Fossil- Fossils of organisms that were common, that lived in many areas and that existed only during specific spans of time. |
