Across
- 3. special type of aircraft, or flying machine, that does not have wings like an airplane
- 5. giant, colorful fabric bag filled with heated air that makes it float in the sky
- 6. Special type of ship designed to travel and operate deep underwater for long periods
Down
- 1. Fast, electric train that travels in tunnels below the ground
- 2. two-wheeled vehicle powered by an engine instead of pedals
- 4. Passenger vehicle that runs on special metal tracks built directly into city streets.