Earth Timeline

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Across
  1. 1. What was the third and longest Period during the Mesozoic Era?
  2. 10. What replaced amphibians?
  3. 13. What sea mammal was alive during the Miocene Epoch?
  4. 15. What organisms began to evolve and expand?
  5. 17. What animals were still roaming the Earth during the Cretaceous Period?
  6. 18. ______ ______ and parts of Europe were the only continents during the Pennsylvanian Period.
  7. 20. What were human-like primates called?
  8. 21. What Epoch was 33.7 to 23.8 (mya)?
  9. 23. The oceans dropped 60m during the Miocene Epoch because of?
  10. 24. The ____ was 11 to 15 percent deeper than right now.
  11. 25. Who had skeletons that resembled modern apes?
  12. 28. What happened to the oceans during the Paleocene Epoch? Hint: They became more _____
  13. 29. What organisms went extinct during the Paleocene Epoch?
  14. 30. What Epoch did the Megladon live during?
  15. 33. How much higher were the oxygen levels during the Mississippian Period compared to today?
  16. 36. During which period were the oldest known fossils of coral reefs found?
  17. 39. Where are Ordovician rocks commonly seen?
  18. 41. What dominated the Triassic Period?
  19. 43. How long were the days in the Devonian Period?
  20. 46. A decline in oxygen and the formation of ___ ____ contained compounds of the Cambrian extinction.
  21. 48. What was the earliest part of Earth's history?
  22. 50. What was the hottest temperature recorded near the equator?
  23. 51. What is the Quaternary Period also known as?
  24. 52. What was the largest predator in the Ice Age?
  25. 54. What did some animals acquire in the Cambrian Period?
  26. 56. Plants began to develop ____ during the Mississippian Period.
  27. 57. What was the largest group during this period?
  28. 58. What epoch contained the last "Ice Age"?
  29. 59. What was the large variety of fish called during the Silurian Period?
Down
  1. 1. What is the oldest known land plant?
  2. 2. What did a drop in carbon dioxide in the atmosphere due to the Earth's temperature?
  3. 3. What Epoch name comes from Greek and means old or older?
  4. 4. There were 2-4 ____ dinosaurs during the Jurassic Period.
  5. 5. What formed after the Indian Plate and Asian Plate collided?
  6. 6. The climate during the Holocene was a result of changes in?
  7. 7. The climate was very hot and humid during what period?
  8. 8. What was developed during the "Age of Early Life"?
  9. 9. The Oligocene climate was _____ that the modern climate.
  10. 11. What Period occurred when the first dinosaurs walked the land?
  11. 12. What started the diversity of many of Earth's organisms?
  12. 14. What Period is sometimes called the Fish Age?
  13. 16. What was the largest animal during the Jurassic Period?
  14. 19. What happened to 95% of life on Earth?
  15. 22. What period lasted 541 million to 485.4 years ago?
  16. 26. What was the massive continent created during the Permian Period?
  17. 27. What Era was the "Age of Early Life"?
  18. 31. When did India and Asia collide?
  19. 32. What period ended with a massive meteorite impact?
  20. 34. When did whale ancestors abandon their territory in favor of a sea going existence?
  21. 35. What went extinct during the Great Ice Age?
  22. 37. What kind of flowers appeared by the end of the Oligocene Epoch?
  23. 38. What period did animals start to lay hard-shell eggs?
  24. 40. The Cretaceous Period was the _______ geological Period in the entire Phanerozoic.
  25. 42. What Epoch is known as the "Age of Man"?
  26. 44. What period did modern animals begin to develop?
  27. 45. What was mass extinction driven by?
  28. 47. What was the climate like during the Eocene Epoch?
  29. 49. Who defined the Ordovician Period?
  30. 53. What began in Western North America during the Eocene
  31. 55. The first _____ evolved during the Pennsylvanian Period.