Water at Work

12345678
Across
  1. 2. to move freely.
  2. 4. when you change something.
  3. 7. energy that makes things work.
  4. 8. to do something without danger.
Down
  1. 1. a form of energy.
  2. 3. to make something.
  3. 5. to reach a place.
  4. 6. things that people buy and sell.