Environment

1. land with farms, fields, and nature outside cities
2. man-made chemicals that damage the ozone layer
4. thick, dirty air you can see, usually brown or gray
5. a very dry area with little rain and few plants
7. at risk of disappearing forever
8. natural homes where animals and plants live
11. accidents when liquid spreads or pours out where it shouldn't (for example ,into the ocean from a ship)
14. a glass building where plants are grown; it traps heat inside to keep plants warm
16. substances made by mixing different materials
17. when roads are full of traffic and cars move slowly
18. warmth or high temperature; the hotness from the sun or fire

1. made dirty or unsafe by harmful substances
3. dirty gases that come out of cars and vehicles
6. thick forests with many trees and heavy rainfall
9. the layer of air around the Earth
10. when water covers land that is usually dry
12. in danger of being harmed or destroyed; at risk of something bad happening
13. something that makes air, water, or land dirty and unsafe
15. when a type of animal or plant no longer exists