Across
- 2. to rise high in the air while flying without moving the wings or using power
- 5. having a hole or empty space inside
- 6. to move up or climb something
- 7. a substance that is used to provide heat or power, usually by being burned
- 9. to change or develop gradually
- 12. something that provides power in machines
- 13. a journey in an aircraft
Down
- 1. to leave the ground and begin to fly
- 3. to fly by floating on air currents instead of using power from wings or an engine
- 4. the flat part of the body that a bird, insect, or bat uses for flying
- 6. to give permission for someone to do something, or to not prevent something from happening
- 8. the amount that something or someone weighs
- 10. to arrive on the ground or other surface after moving down through the air
- 11. a person who flies an aircraft