Evolution crossword puzzle

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Across
  1. 2. "Older rock layers lay beneath younger ones"
  2. 5. The process by which chemicals present in organic matter are decomposed or oxidized into easily available forms to plants.
  3. 7. The creator of the theory of evolution
  4. 8. A fossil that is used for dating
  5. 10. Determining the past of an artifact by analyzing it
  6. 13. The theory that species change over time and share a common ancestor
  7. 15. The process of species changing over time
Down
  1. 1. "Organisms that best adjust to their environment are more likely to survive and reproduce"
  2. 3. The ship that Charles Darwin traveled in
  3. 4. The identification of traits in plants and animals
  4. 6. The history of an organism's life documented by fossils
  5. 9. The book that Charles Darwin wrote on the theory of evolution
  6. 11. A method used to date rocks
  7. 12. A diagram that shows the rock formations of a region
  8. 14. The preserved remains of a prehistoric organism