Earth and Space

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Across
  1. 2. Period which ends in the disappearance of dinosaurs
  2. 4. Period which ends with the disappearance of 70% of marine species
  3. 8. A layer made up of sedimentary rock
  4. 11. When an organisms tissues are replaced by minerals to form a rock-like material
  5. 12. When a species cannot adapt to changes in their environment, so they die.
  6. 14. A natural, solid substance
  7. 17. Type of rock formed by the deposition of material at the Earth's surface and in bodies of water
Down
  1. 1. Someone who studies fossils
  2. 3. Source of energy that comes from space
  3. 5. Period which ends with the disappearance of about 50% of animal species
  4. 6. Period which ends with the disappearance of 96% of marine species and 75% of land species
  5. 7. Lightning
  6. 9. When a species changes to survive their surroundings
  7. 10. When sediment comes off of land or a mountain
  8. 13. paleozoic and mesozoic are both this thing
  9. 15. Period in the mesozoic era which ends in the disappearance of 50% fish, sponge, and corals
  10. 16. Any remains or trace of an organism that has been preserved for a very long time in rock, usually sedimentary