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Chapter 10, Section 1-5

Chapter 10, Section 1-5. Question 1 - 10. are the preserved remains or traces of living things. Answer 1 – 10. fossils. Question 1 - 20. Fossils provide evidence of. Answer 1 – 20. how life has changed over time. Question 1 - 30.

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Chapter 10, Section 1-5

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  1. Chapter 10, Section 1-5

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

  3. Answer 1 – 10 • fossils

  4. Question 1 - 20 • Fossils provide evidence of

  5. Answer 1 – 20 • how life has changed over time

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

  7. Answer 1 – 30 • mold

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

  9. Answer 1 – 40 • The fossil record

  10. Question 1 - 50 • List the steps of how fossils are most commonly formed

  11. Answer 1 – 50 • Organism dies • Organism is buried by sediment • Sediment hardens and preserves fossil

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

  13. Answer 2 – 10 • absolute age

  14. 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

  15. Answer 2 – 20 • The Law of Superposition

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

  17. Answer 2 – 30 • Unconformity

  18. Question 2 - 40 • What is an index fossil?

  19. Answer 2 – 40 • A fossil that is widely distributedand representsa type of organism that only existedbriefly

  20. Question 2 - 50 • Index fossils are useful because-

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

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

  23. Answer 3 – 10 • radioactive decay

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

  25. Answer 3 – 20 • half-life

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

  27. Answer 3 – 30 • Potassium-Argon Dating

  28. 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?

  29. Answer 3 – 40 • radioactive

  30. Question 3 - 50 • Why is Radioactive dating is good for igneous rocks but not sedimentary rocks

  31. Answer 3 – 50 • Scientists can date particles but not layers in sedimentary rocks. • Scientists can only date solid rocks.

  32. Question 4 - 10 • a record of the life forms and geologic events in Earth’s history

  33. Answer 4 – 10 • geological time scale

  34. Question 4 - 20 • After Precambrian Time, basic units of the GTS are

  35. Answer 4 – 20 • eras and periods

  36. Question 4 - 30 • three long units of time from Precambrian Time to the present, Ex: The Paleozoic, Mesozoic, and Cenozoic

  37. Answer 4 – 30 • Eras

  38. Question 4 - 40 • Later, _________________________determined absolute age of divisions in the GTS

  39. Answer 4 – 40 • radioactive dating

  40. Question 4 - 50 • What happened during the Precambrian time period?

  41. Answer 4 – 50 • 1st oceans, atmospheres, landforms, and single-celled organisms.

  42. Question 5 - 10 • Scientists hypothesize that the Earth formed at the same time as other planets and the sun at what time?

  43. Answer 5 – 10 • about 4.6 billion years ago

  44. Question 5 - 20 • Earth started as a ball of

  45. Answer 5 – 20 • dust, rock, and ice in space

  46. Question 5 - 30 • As Earth cooled, water vapor condensed forming rain, accumulating to form

  47. Answer 5 – 30 • The oceans

  48. Question 5 - 40 • Without earth’s earliest life forms we would have no…

  49. Answer 5 – 40 • Oxygen/ozone

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