unit4 puzzle

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Across
  1. 1. the study of the earth
  2. 4. not interesting
  3. 6. keep in mind
  4. 7. get knowledge or skill
  5. 10. helpful or of use
Down
  1. 2. making you feel excited
  2. 3. the study of past events
  3. 5. a difficult situation
  4. 8. why something happens
  5. 9. having a lot to do