Earth and space

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Across
  1. 5. the name for someone who study's fossils
  2. 7. multiplication of reptile species
  3. 9. term used for 100% of a species going extinct
  4. 10. a period in which marine life first appeared (vertebrates) (fish)
  5. 11. what happens when you look at medusa
  6. 12. appearance of first dinosaurs
  7. 15. the discharge of magma becoming lava
  8. 16. the name for multiple periods of time
Down
  1. 1. the adjustment to living conditions
  2. 2. appearance of flowering plants
  3. 3. another word for the same type of animal
  4. 4. period in which amphibians first appeared
  5. 6. the name for buildup of sediment
  6. 8. the finished product of Petrification
  7. 13. large flaming ball in space
  8. 14. the item that gets fossilized