10.2 Geologic Time

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Across
  1. 3. The span of time between Earth's formation that 90% of Earth's history occurred.
  2. 4. An era divided into 3 time periods Triassic, Jurassic,& Cretaceous
  3. 5. The era that the continents moved to their current position.
  4. 8. the trace of an organism that lived long ago.
  5. 10. Dominated the planet during the Mesozoic era.
  6. 11. Consists of club moss,ferns,& horsetails.
  7. 13. A time scale that divides Earths history.
  8. 14. single celled, photosynthetic organisms
  9. 16. A generic term that groups humans and our extinct ancestors.
Down
  1. 1. When life forms evolved from simple unicellular
  2. 2. A era in which the supercontinent Rodinia broke and formed Pangea.
  3. 6. Mammals that continue development while living in their mother's pouch
  4. 7. Mountains formed when the Indian subcontinent.
  5. 9. All landmasses combined into one.
  6. 12. Fossils made from organisms that lived 600 to 545 million years ago
  7. 15. a period where large sections of Earth was covered in ice and snow.