Geologic Time Scales Puzzle

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Across
  1. 3. The age of the dinosaurs in which the continents continued to drift and the climate became warmer
  2. 4. The transitional species between humans and apes
  3. 5. The period in which the climate became drier and the continents started to drift together
  4. 6. The current interglacial period with relatively stable climates and human expansion
  5. 9. Characterized by a series of ice ages and interglacial periods and humans evolved during this time
  6. 11. The eon of visible life which is characterized by the emergence of all major groups of plants and animals
  7. 12. The largest unit of geologic time spanning hundreds of millions to billions of years
  8. 13. Humans
  9. 16. The last period of the Cenozoic era in which humans evolved and became the dominant species Earth and is also known for its ice ages
  10. 17. The earliest eon in Earths history characterized by volcanic activity and bombardment by asteroids and comets
Down
  1. 1. The era that the dinosaurs were the dominant land animals on Earth
  2. 2. The age of the coal forests in which huge amounts of the coal we used to form lived in this time
  3. 7. The age of the mammals in which the continents moved to their current positions and mammals have diversified further
  4. 8. The period in which the dinosaurs and other animals continued to diversify until the second largest mass extinction events
  5. 10. Subdivisions of periods that last for hundreds of thousands to millions of years
  6. 14. Subdivisions of eras that are defined by major changes in the fossil record
  7. 15. Subdivisions of eons spanning tens to hundreds of millions of years