Time Marches On...

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Across
  1. 2. hominids came along
  2. 5. the series of process in which a rock forms and changes from on rock to another
  3. 6. a principle that states that geologic processes that occurred in the past can be explained by current geologic processes
  4. 9. the death of every member of a species
  5. 10. glaciers formed at the poles
  6. 12. meteorites bombarded the planet while volcanoes spewed lava and filled the atmosphere with poisonous gasses
  7. 15. the standard method used to divide the earths long natural history into manageable parts
  8. 17. a unit of geological time
  9. 18. the quality of a rocks that is based on the size and shape
  10. 19. visible lines on a rocks
  11. 20. immense shallow oceans covered much of the ancient continents
  12. 22. by this period earths barren landscapes where turning green
  13. 25. the process by which wind water ice or gravity transports soil and sediments from location to location
  14. 27. a unit of geologic time into which eras are divided
Down
  1. 1. there where 4 of these that killed most animals on earth
  2. 3. europe asia and north america clustered together at the equator
  3. 4. a solid mineral formed in the rock cycle
  4. 7. the largest division of geologic time
  5. 8. called the age of dinosaurs
  6. 11. the trace or remains of an organism that lived long ago, most commonly preserved in sedimentary rock
  7. 13. a principle that states that geologic change occurs suddenly
  8. 14. the scientific study of fossils
  9. 16. the process in which sedimentary rocks are arranged in layers
  10. 18. when age of dinosaurs came to a end
  11. 21. during this time the continents where coming together to make one landmass Pangaea
  12. 23. a subdivision of a geologic period
  13. 24. a fossil used to date other fossils
  14. 26. foliated nonviable lines on a rocks