Science

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Across
  1. 3. survival of the fittest
  2. 4. study of body structure
  3. 7. earth is mostly comprised of _________
  4. 9. the name of Earth's ancient supercontinent
  5. 11. alternative energy that uses falling water
  6. 14. solar energy is __________
  7. 15. a resource that is not easily replaced
  8. 16. phenomenon responsible for shifting tectonic plates
  9. 18. earth's
  10. 19. a later of crust folds under another
Down
  1. 1. energy produced by the heat within the Earth
  2. 2. selective breeding for desired traits
  3. 5. a change in the genetic sequence
  4. 6. earth's crust is destroyed at the __________ boundaries
  5. 8. fracking poses a threat to which natural resource
  6. 10. small sequences in DNA
  7. 12. new crust is formed at _________ boundaries
  8. 13. humans have 23 pairs of __________
  9. 17. resistance to flow
  10. 20. came up with the theory of natural selection