2. fossils Relative age of rocks Radioactive dating Sedimentary Rocks evidence 10 20 30 40 50

3. Question 1 - 10 are the preserved remains or traces of living things.

4. Answer 1 – 10 fossils

5. Question 1 - 20 Fossils provide evidence of

6. Answer 1 – 20 how life has changed over time

7. Question 1 - 30 a hollow area in sediment in the shape of or part of an organism.

8. Answer 1 – 30 mold

9. Question 1 - 40 evidence of the history of life and past environments on Earth is called

10. Answer 1 – 40 The fossil record

11. Question 1 - 50 When sediments bury an organism releasing some gases leaving carbon behind this is called:

12. Answer 1 – 50 Carbon film

13. Question 2 - 10 The number of years since the rock formed

14. Answer 2 – 10 absolute age

15. Question 2 - 20 In horizontal sedimentary rocks, the oldest layer is at the bottom and the newest layer is on the top and determines the relative ages of rocks

16. Answer 2 – 20 The Law of Superposition

17. Question 2 - 30 the surface where new rock meets up with a much older rock surface.

18. Answer 2 – 30 Unconformity

19. Question 2 - 40 What is an index fossil?

20. Answer 2 – 40 A fossil that is widely distributed and represents a type of organism that only existed briefly

21. Question 2 - 50 Index fossils are useful because-

22. Answer 2 – 50 tell the relative ages of rock layers by how they occur

23. Question 3 - 10 As elements break down over time they release particles and energy in a process called

24. Answer 3 – 10 radioactive decay

25. Question 3 - 20 How fast or slow the radioactive elements decay is always constant (never changing) and the rate of decay is called

26. Answer 3 – 20 half-life

27. Question 3 - 30 Very useful in dating rocks because it has a long half-life

28. Answer 3 – 30 Potassium-Argon Dating

29. Question 3 - 40 When carbon-14 is left in an organism, scientists measure this amount that is left to find absolute age. Is the carbon-14 the radioactive element or the new element formed?

30. Answer 3 – 40 radioactive

31. Question 3 - 50 Is Carbon-14 good for dating rocks? Why/ Why not?

32. Answer 3 – 50 No Carbon-14 is only good for dating plants and animals that contain carbon and only dates up to 50,000 years

33. Question 4 - 10 What is sediment?

34. Answer 4 – 10 Small particles of rock and remains of living things

35. Question 4 - 20 How does sedimentary rock form?

36. Answer 4 – 20 When sediments build up in layers and harden

37. Question 4 - 30 Why is it hard to determine relative age of sedimentary rock that has a fault in it?

38. Answer 4 – 30 Movements along the fault cause layers to not line up

39. Question 4 - 40 What are the steps on how fossils typically form in sedimentary rocks?

40. Answer 4 – 40 Organism dies Organism is buried by sediment Sediment hardens and preserves fossil

41. Question 4 - 50 Why is Radioactive dating is good for igneous rocks but not sedimentary rocks

42. Answer 4 – 50 Scientists can date particles but not layers in sedimentary rocks. Scientists can only date solid rocks.

43. Question 5 - 10 A fossil that shows an organisms activity, not the actual organism is called:

44. Answer 5 – 10 Trace fossil

45. Question 5 - 20 If coal is found in Antarctica, this shows evidence of

46. Answer 5 – 20 Past climates

47. Question 5 - 30 Fossils found in dry plains and plateaus show

48. Answer 5 – 30 Evidence of past environments

49. Question 5 - 40 Fossils occurring in a particular order such as simple organisms coming before more complex ones is evidence of

50. Answer 5 – 40 Change in the fossil record

51. Question 5 - 50 Geologists identifying an organism based on structure of shells and based on those differences can identify rock layers which certain fossils are found is evidence of how…

52. Answer 5 – 50 Scientists use index fossils to date rocks