In two half-lives, 25 percent of the parent element is left.
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Q10: A catastrophic flood might produce a disconformity.
Q11: If dike A cuts across sill B,
Q12: Correlation is the process of matching similar
Q13: Marine fossils are easily identified, geographically extensive,
Q14: Well cuttings enable geologists to correlate rock
Q16: Accurate radiometric dates are possible from any
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Q18: Radiometric dates from closed systems are more
Q19: Radioactive decay is the process by which
Q20: Carbon 14 dates would be useful to
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