Watch 5 minute video clips, get step by step explanations, take practice quizzes and tests to master any topic. Once solidified, the lead is "locked" in place and since the uranium decays to lead, the lead-to-uranium ratio increases with time.
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High School Biology: Tutoring Solution. Try it risk-free for 30 days. Continue back. It is often used to describe population decreases or increases, which depicts exponential growth and can be seen using a graph of an exponential curve.