Geological time scale & earth features

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Across
  1. 3. 96% of all life on earth became extinct during this time
  2. 4. shorter subdivisions of periods in geological time
  3. 6. break in the earth's lithosphere
  4. 7. The layer of rock that forms Earth's outer surface.
  5. 10. Cenozoic, Mesozoic and Paleozoic are examples
  6. 11. animal with a backbone
  7. 14. rock that is formed in layers under pressure over time
  8. 15. rocks that form from hardened magma
Down
  1. 1. rocks that change over time under pressure and heat
  2. 2. animal without a backbone
  3. 5. an opening in the Earth's crust that allows magma and gasses through.
  4. 8. period that contained the first dinosaurs
  5. 9. a low area between mountains or hills where streams and rivers often flow. formed when continental plates separate
  6. 12. one of three long units of time between precambrian and present day
  7. 13. Center of the earth