Life On Earth

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Across
  1. 4. part of Earth in which life exists including land, water, and air or atmosphere
  2. 6. instrument for measuring speed
  3. 12. a paper copy of a document made with a special machine
  4. 13. arrangement of events in time
  5. 14. Scientific study of interactions between organisms and their environment
  6. 16. A characteristic or constant factor, limit
  7. 18. the study of the earth's physical and cultural features
  8. 19. attractive in pictures or photographs
Down
  1. 1. having the same shape, size, and position on both sides of a dividing line
  2. 2. arranged in order of time
  3. 3. having a form composed of one or a number of simple shapes, such as triangles, squares, or circles
  4. 5. to cause to happen at the same time
  5. 7. a particle of light
  6. 8. science dealing with the earth's history as recorded in rocks
  7. 9. the study of weather
  8. 10. a close relationship of mutual dependence
  9. 11. A model of the universe in which Earth is at the center of the revolving planets and stars.
  10. 12. a device that converts light energy into electrical energy
  11. 15. An instrument that measures distance traveled by a vehicle
  12. 17. continuing for a long time