trade/transportation

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Across
  1. 1. traveled on foot or by animals
  2. 4. when you exchange items
  3. 7. sea and ocean travel
Down
  1. 2. one of the best travel rivers
  2. 3. some used this machine to travel on land
  3. 5. one of the animals they used to travel onland
  4. 6. one of the most traded item