CHANGES AROUND US

12345678910
Across
  1. 7. a change that cannot be carried out in the reversed direction .
  2. 9. when a substance combines with another to form a new substance.
  3. 10. when iron metal is exposed in the atmosphere metal reacts with oxygen and
Down
  1. 1. a change that can be carried out in the reverse direction .
  2. 2. increases its size because kept near hot sun .
  3. 3. changes that do not repeat themselves at regular intervals of time.
  4. 4. decreases its size because kept in cold water.
  5. 5. changes affecting the form of a chemical substance .
  6. 6. events that repeat themselves after a certain amount of time.
  7. 8. vapor to form a new substance iron oxide and the process is named as