Changes Around Us

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Across
  1. 3. damage caused to metal
  2. 5. substances that are required in chemical change byt do not cahnge itself
  3. 6. substance that take part during a reaction
Down
  1. 1. the energy required to start a chemical reaction
  2. 2. result after a chemical reaction
  3. 4. a brown coating of iron oxide formed om steel