Across
- 4. a boat that carries people and cars across water (noun)
- 6. animals or plants at risk of disappearing (adj.)
- 9. the busies and most expensive time for holidays (noun)
- 10. using resources in a way that protects the future (noun)
- 11. advantage (noun)
- 12. very full of people, cars, or things (adj.)
Down
- 1. a train that runs below the city (noun)
- 2. difficult (adj.)
- 3. dirty air, water, or land caused by people (noun)
- 5. energy source that never runs out (like sun or wind) (adj.)
- 7. a person who comes to a place for a short time (noun)
- 8. a person who goes from one place to another (noun)