1. Examine the graph in Figure 3 and answer the following questions. [5 Points] a. Which line (A or B) represents the percentage of parent atoms over time? [Answer] b. What does the other line represent? [Answer] c. The half-life for this radiometric system is 5 million years. You date a mineral crystal using this system and find that 3 half-lives have elapsed. How old is the mineral crystal? [Answer] d. You date another mineral crystal using this same system and find that 50% of the atoms are parent atoms. How many half-lives have elapsed in this mineral crystal? How many years old is this mineral crystal? [Answer] Percentage in sample 100% 90% 80% 70% 60% 50% 40% 30% 20% 10% 0% 0 1 2 3 Half-lives passed Figure 3 A -B