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8 Cards in this Set
- Front
- Back
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Intrusion |
The action or process of forcing a body of igneous rock between or through existing formations, without reaching the surface.
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Extrusion |
The movement of magma onto the surface of the earth through volcano craters and cracks in the earth's crust, forming igneous rock.
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Uniformitarianism |
The theory that changes in the earth's crust during geological history have resulted from the action of continuous and uniform processes.
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Relative Age |
The geologic age of a fossil organism, rock, or geologic feature or event defined relative to other organisms, rocks, or features or events rather than in terms of years.
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Absolute Age |
The age of a geologic formation in years. Unlike relative age, which determines whether a formation is older or younger than its surrounding formations, absolute age provides geologists with the actual age of a formation.
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Index Fossil |
A fossil that is useful for dating and correlating the strata in which it is found
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Superposition |
A principle of quantum theory that describes a challenging concept about the nature and behavior of matter and forces at the sub-atomic level.
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Half- Life |
The time taken for the radioactivity of a specified isotope to fall to half its original value. |
