The finding of an abnormally high concentration of the element named ______________ was the first clue to the probable cause of the K-T event.
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Q118: Eons are subdivided first into _.
Q119: The Cenozoic era consists of only two
Q120: We live in the _ eon.
Q121: We live in the _ epoch.
Q122: Reasonable values for the absolute ages of
Q124: The span of time required for the
Q125: The K-T event occurred about _ million
Q126: Lead that comes from radioactive decay is
Q127: Carbon dating was used to establish the
Q128: The Paleozoic era ended and the Mesozoic
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