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