Biodiversity and Rocks

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Across
  1. 4. rocks formed by extreme heat and pressure
  2. 7. program to allow species to reproduce in a safe environment
  3. 8. flightless extinct bird
  4. 9. store of genetic material for research
  5. 13. upper layer of the Earth
  6. 15. features that allow an animal to live successfully in its environment
  7. 17. rocks formed by compacted layers
  8. 18. no more of a species left
Down
  1. 1. range of different species in an environment
  2. 2. semi-molten layer of the Earth
  3. 3. small holes in a rock that can allow water to get in
  4. 5. maintaining the species natural environment as much as possible
  5. 6. a species at risk of extinction
  6. 7. the central bit of the Earth
  7. 10. when old rock and fossils are exposed
  8. 11. rocks formed when magma cools
  9. 12. parts of a polar bear's paws that allow it to grip the ice
  10. 14. plates sections of the crust that can rub together to cause earthquakes
  11. 16. wearing away of rocks by rain, wind, plants etc