Evolution of transport and communication

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Across
  1. 2. The invention of the ___________ engine leads to the replacement of animal-driven cart.
  2. 5. Which Italian merchant travelled along the Silk Road?_________.
  3. 7. Sledged are the mode of transport in ______________.
  4. 9. _________ is an exchange of meanings between individuals through a common system of symbols.
  5. 11. We use ____________ to cross a river.
  6. 12. __________ send messages through a code system.
Down
  1. 1. __________ is one of the most important inventions of human history.
  2. 3. Connecting with large number people is known as ___________
  3. 4. _____________ has been a primary reason behind many voyages.
  4. 6. What is an important trade route connecting China and Italy? _________.
  5. 8. Who invented television?________.
  6. 10. World's longest railway platform is in _____________.