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14 Cards in this Set
- Front
- Back
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the forces and processes that we observer today have been at work ________________________ |
for a very long time |
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the fundamental principle of ____________ states that the physical,chemical,and biological laws that operate today have also operated in the geologic past. |
uniformitarianism |
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the principle of cross-cutting relationships states that when a fault cuts through rock laters of the fault or intrusion is ______ than the rocks affected |
younger |
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the law of __________ is the basis of relative dating |
superposition |
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an angular unconformity indicates that during the pause in deposition a period of _________________________ and erosion occurred |
deformation (folded or tilted) |
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two sedimentary rocks that are separated by an erosional surface are called a _____________ |
disconformity |
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fossils are the remains or traces of ___________________ |
prehistoric life |
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what has the best chance of being part of a fossil record |
fish |
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the principle of fossil succession states that fossil organisms __________________________... |
succeed one another in a definite and determinable order |
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_________ is the name given to an element that has the same atomic number but different mass number |
isotope |
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a half-life is the amount of time necessary for ____________ of the nuclei in a sample to decay to its stable isotope |
on-half |
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radiocarbon dating can be used to date _______ geological events up yo about _______ years. |
recent - 75,000 |
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radiocarbon dates can be determined by comparing the ration of ________ to _______ in a sample |
carbon-14 carbon-12 |
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the currently accepted age of the earth is ______________ because meteorites have been dated back to this age |
4 billion years |
