Words With Greek roots chron, meter, photo, bio, geo, logy

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Across
  1. 5. the study of Earth's landscapes, peoples, places, and environments
  2. 6. arranged in the order of time
  3. 9. a limit that affects how something can be done
  4. 10. a tiny particle or bundle of electromagnetic radiation (light)
  5. 12. to copy with light
  6. 15. an instrument for measuring the distance traveled
  7. 17. it is equal on both sides
  8. 18. the study of the relationships between living organisms
Down
  1. 1. of or to associate with geometry
  2. 2. an instrument that measures speed
  3. 3. two or more different organisms, living in, or being in a close association
  4. 4. having or relating to the Earth as the center
  5. 7. the study of weather
  6. 8. to happen at the same time
  7. 9. producing or generating light
  8. 11. the region of the earth that encompasses all living organisms
  9. 12. device that converts light into electrical energy by producing a voltage
  10. 13. the study of Earth
  11. 14. continues or occurs repeatedly over a long period of time
  12. 16. the study of time