Grade 3 SS review

4. The height of land above sea level.
6. To save and protect resources.
8. Resource: A resource that can be replaced in a short time.
10. Region: A place where many kinds of factories are located.
12. The washing away of soil by rain, wind, or rivers.
14. An area in an arctic climate where the ground is frozen nearly all year.
16. Sun-dried bricks used to build shelters.
18. The weather a place has over a long period of time.
19. What happens when chemicals or smoke harm the air or water.
23. The kinds of plant life that grow in an area.
24. A violent shaking of the earth.

1. One of the seven largest land areas on Earth.
2. To change the way you do something to fit the environment.
3. To use an item again.
5. Resource: A resource that takes a long time to replace or cannot be replaced.
7. To change the environment.
9. All the living things (plants and animals) interacting with each other in one place.
11. Region: A place with flat land and rich soil, used for farming.
13. A large area that has at least one feature making it different from other areas.
15. The daily conditions outside.
17. A mountain that erupts in an explosion of molten rock (lava) and ash.
20. The natural shape of a part of Earth's surface.
21. Hazard: An event in nature that can cause changes to the land.
22. Resource: Something found in nature that people use.
25. A big storm with strong winds and a lot of rainfall.