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10 Cards in this Set
- Front
- Back
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relative age |
its age conpared to ages of other rocks. |
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always younger..? |
intrusion |
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a gap in the geological record |
unconformity |
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gove examples of species that lived on earth for short periods of time & tell the relative age of a rock in which they occur..? |
index fossil |
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rock's exact age |
absolute age. |
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James Hutton "the present is a key to the past," principle of... |
uniformitarianism. |
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the oldest rocks are on the bottom and become younger toward the top is explained as...? |
the law of superposition. |
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how rocks are classified as igneous, sedimentary, or metamorphic.. |
rocks are classified by how thet were formed. |
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forms when lava erupts, theb cool and hardens |
extusion |
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when atoms of an unstable element break down to form atoms of another, stable element |
radioactive decay |
