Greek Roots Crossword puzzle

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Across
  1. 4. make things happen at the same time
  2. 5. study of rocks and Earth's physical structure
  3. 6. shapes and their properties
  4. 8. changes light into electricity
  5. 9. system includes all living things on Earth
  6. 13. speed of a car
  7. 15. light particle
  8. 16. exact replica of something
  9. 17. relationship where both parties benefit
  10. 18. looks the same
  11. 19. persist for a long time
Down
  1. 1. study of weather
  2. 2. to arrange in order
  3. 3. earth is the center of the universe
  4. 7. measure distance traveled
  5. 10. study of earth's landscapes and environment
  6. 11. events in order in which they happen
  7. 12. the study of living things interact with environment
  8. 14. a boundary or limit
  9. 15. object looks attractive in photographs