Prior to the discovery of radioactivity in the late ______ century,geologists were able to develop a(n)____________________ geologic time scale.
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Q28: The half-life of a radioactive element is
Q29: The time necessary for half of the
Q32: If the dating technique is used correctly,how
Q34: What kind of rocks (igneous,sedimentary,metamorphic)have been most
Q35: How are marker beds used to determine
Q36: In order to correlate age-equivalent rock units
Q45: _ dating is used to obtain absolute
Q50: To determine the age of sedimentary rocks
Q52: Different varieties of an atom that have
Q53: The most accurate radiometric dates are obtained
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