Changes around us

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Across
  1. 3. the original substances present is known as
  2. 4. rusting of iron
  3. 5. the new substances formed during our after chemical reaction
  4. 7. A chemical change occurs when there is a ______
Down
  1. 1. the molten wax becomes solid when cooled
  2. 2. the energy required to stay a chemical reaction
  3. 6. chlorophyll in plants