Crossword Puzzle IV

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Across
  1. 1. to protect or watch over
  2. 5. tube for carrying liquid or gas
  3. 6. substance things are made of
  4. 9. buying and selling goods
  5. 10. hollow space in the ground
  6. 11. thin piece of wood
  7. 12. to carry from one place to another
  8. 13. underground part of a plant
Down
  1. 2. to save from danger
  2. 3. terrible event causing damage
  3. 4. to look for something
  4. 7. production of goods in factories
  5. 8. visitor or customer
  6. 12. group working together