Across
- 3. Full of people, cars, or activity
- 4. Cars, bikes, and buses on the roads
- 5. An area outside a city where people live
- 6. A place where planes take off and land
- 7. Dirty air, water, or land caused by people or machines
- 8. Not much noise or activity
- 10. New and using the latest ideas or style
- 11. A structure built over a river, road, or other obstacle
Down
- 1. A very tall building in a city
- 2. Buses, trains, or subways used by many people
- 5. A place where trains or buses stop for passengers
- 9. A green area in a city with grass, trees, or playgrounds