Continuity and Change Crossword

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Across
  1. 6. predecessor to refrigerator
  2. 7. Canada was known for making this synthetic material
  3. 8. what insulin is a treatment for
  4. 10. hydroelectricity is a _____ energy source
Down
  1. 1. invented insulin
  2. 2. company that popularized icebox cakes
  3. 3. what type of lettuce was developed because of freezers
  4. 4. _____ made it possible to communicate to other continents
  5. 5. the radio changed how _____ spread
  6. 9. appliance for cleaning floors