Earth and space

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