Across
- 4. the ship that can travel under water
- 6. train that moves very quickly
- 8. a country that first invented a submarine
- 9. a vehicle designed for air travel
- 10. a vehicle used for space travel
Down
- 1. a country has a modern high-speed train
- 2. big balloon filled with heated air which people can ride
- 3. a country where astronauts flew to Mars for the first time
- 5. a country with the most plane in the world
- 7. a country is popular with hot-air balloon