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15 Cards in this Set
- Front
- Back
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What means that the forces and processes that we observe today have been at work for a very long time
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uniformitarianism
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An what represents a long period during which deposition stopped, erosion removed previously formed rocks, and then deposition resumed
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unconformity
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are the remains or traces of prehistoric life
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fossils
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What are widespread geographically, are limited to a short span of geologic time, and occur in large numbers
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Index fossils
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What is the spontaneous decay of certain unstable atomic nuclei
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radioactivity
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what is the procedure of calculating the absolute ages of rocks and minerals that contain radioactive isotopes
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radiometric dating
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the what states that in an indeformed sequence of sedimentary rocks, each bed is older than the one above it and younger than the one below it
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law of superposition
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are rocks contained within other rocks
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inclusions
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what is when the erosional surface seperates older metamorphic or intrusive igneous rocks from younger sedimentary rocks
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noncomformity
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is the establishing the equivalence of rocks of similar age in different areas
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correlation
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what fossils are indriect evidence of prehistoric life
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trace
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fossils can be used to interpret and describe
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ancient environments
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what is the amount of time necessary for one-half of the nuclei in a sample to decay to a stable isotope
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half-life
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orbiting the nucleus of atoms are what which are negative electrical charges
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electrons
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what is the method for determining age by comparing the amount of carbon-14 to the amount of carbon-12 in a sample
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radiocarbon dating
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