UN 1 WK 2 Spelling Words

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Across
  1. 7. a particle of light
  2. 8. an instrument used to measure distance traveled
  3. 11. numerical summary of a population
  4. 13. a paper copy of a document or picture that is made with a special machine
  5. 14. science dealing with the earth's history as recorded in rocks
  6. 15. study of how living things interact with each other and their environment
  7. 17. arranged in order of time
  8. 19. A model of the universe in which Earth is at the center of the revolving planets and stars.
Down
  1. 1. mutually beneficial; supporting one another's life
  2. 2. part of Earth in which life exists including land, water, and air or atmosphere
  3. 3. the study of weather
  4. 4. instrument for measuring speed
  5. 5. to cause to happen at the same time
  6. 6. the study of the earth's physical and cultural features
  7. 9. having the same shape, size, and position on both sides of a dividing line
  8. 10. continuing for a long time
  9. 11. attractive in pictures or photographs
  10. 12. having a form composed of one or a number of simple shapes, such as triangles, squares, or circles
  11. 16. a device that converts light energy into electrical energy
  12. 18. arrangement of events in time