Answer Key to Old Lecture Exam 3

1. d

2. d

3. a

4. a

5. b

6. b

7. b

8. b

9. a

10. c

11. b

12. c

13. c

14. c

15. c

16. d

17. d

18. c

19. d

20. a

21. d

22. c

23. a

24. e

25. b

26. f

27. g

28. j

29. h

30. I

31. Radioactive

32. Visible

33. Half life

34. Lithostratigraphy

35. Dip

36.

1. 875 daughters +125 Parents = 1000 Parents originally

First half life = 500 Parents + 500 daughters

Second half life = 250 Parents + 750 daughters

Third half life = 125 Parents + 875 daughters

Answer: 3 Half Lives

2. Age = 3 half lives X 1.3 billion years =3.9 billion years old