Time Marches On...

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