EARTH & SPACE

1234567891011121314151617181920212223
Across
  1. 2. wiped out by meteor.
  2. 4. rocks are mostly made of this
  3. 5. changes by different forms of pressure and friction
  4. 7. a type of energy output
  5. 9. disappearance of 96% of marine species and 75% of land species.
  6. 13. death of 70% of marine species
  7. 14. generates lots of ash
  8. 18. name for a kind of grouping of organisms
  9. 20. someone who studies fossils
  10. 22. preserved remains
  11. 23. identification of a time period
Down
  1. 1. layers of minerals
  2. 3. make up our skeleton
  3. 6. appearance of dinosaurs
  4. 8. layers stacked on eachother
  5. 10. this is what pushes the layers together
  6. 11. the reason we survive on earth (takes a long time)
  7. 12. this happend to the dinosaurs
  8. 15. appearance of plants
  9. 16. the change from bone to mineral
  10. 17. the ending of an organism
  11. 19. heats the earths surface to this day
  12. 21. death of 50% of animal species