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Students review relative dating principles by interpreting a block diagram and are then introduced to radioactive decay and the concept of half-life to determine numerical ages. There is some ambiguity in the block diagram, so students must determine numerical ages for samples from the block diagram to test their relative age hypotheses. Students "date" samples from the block diagram by counting the number of 235U and 207Pb atoms (colored beads) in a zircon (Ziploc bag).
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