Changes Around Us

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Across
  1. 2. ice to water
  2. 3. water to ice
  3. 4. gas to liquid
  4. 7. formation of a reddish brown layer on metals
  5. 8. browning of apples
  6. 9. colouring of paper
Down
  1. 1. can be brought back to its original state
  2. 4. change where composition is changed
  3. 5. rotation of earth
  4. 6. heat is evolved