Across
- 5. To convert waste into new materials
- 6. An instrument used to measure temperature
- 10. A vehicle that runs on electricity
- 12. Unpleasant sounds
- 14. An instrument used to magnify small objects
- 15. A vehicle that can fly
- 17. Machines that can do work automatically
- 22. Energy from the sun
- 23. travel The ability to travel through time
- 27. Harmful substances that pollute the environment
- 28. An animal that is in danger of extinction
- 29. A large number of vehicles moving slowly
- 31. A device used to communicate over long distances
- 33. A famous bridge in San Francisco
- 35. A large body of matter that orbits a star
- 36. Trash that is left lying around
- 37. A famous white marble mausoleum in India
Down
- 1. The force that attracts objects to each other
- 2. A plant that produces oxygen
- 3. A device that propels a person through the air
- 4. Unmanned aircraft
- 7. A vehicle that can travel into space
- 8. A type of radiation used to see inside the body
- 9. A tall, thin tower in Paris
- 11. A system of vehicles that people use to travel
- 13. A tall building in New York City
- 16. A material used to make concrete
- 18. A gas that humans need to breathe
- 19. Three-dimensional images
- 20. Areas of land that are covered in plants
- 21. A natural satellite of Earth
- 24. A place without air, water, or people
- 25. A vehicle that is powered by human power
- 26. A device that carries people up and down
- 30. An instrument used to find direction
- 32. A safety device worn to protect the body in a car crash
- 34. An object that produces light