1. Cycles Review

2. When water turns in to water vapor while in the heat of the sun, this is called… A.Condensation B.Evaporation

3. What is required to turn water vapor into water? A.Warmer Temperatures B.Cooler Temperatures C.Clouds

4. When plants lose water through tiny holes in their leaves, this is called… A.Respiration B.Evaporation C.Transpiration

5. What is the name of the process in which bacteria and fungi break down a dead organism? A.Decomposition B.Decay C.Waste

6. In the nitrogen cycle, bacteria help change nitrogen gas into what substance so that plants can use it? A.Nitrates B.Nitrogen C.Gas

7. What is the name of the process in which water vapor is cooled and changed to liquid water? A.Precipitation B.Evaporation C.Condensation

8. What is the name of the tiny openings in plants through which water is released to the atmosphere? A.Pores B.Stomata C.Roots

9. What gives a plant its energy to grow? A.Water B.Soil C.Sun

10. What gas does a plant return to the atmosphere? A.Oxygen B.Carbon Dioxide C.Nitrogen

11. What gas do animals exhale? A.Nitrogen B.Oxygen C.Carbon Dioxide

12. What converts animal waste into nitrogen? A.Bacteria B.Decomposers C.Both A&B D.None of the above

13. How do animals get most of the nitrogen they need to live? A.By eating plants B.By going to the bathroom C.By breathing the Nitrogen in the air

14. What causes water to evaporate? A.Weather B.Heat C.Condensation

15. How much of the Earth’s atmosphere is Nitrogen? A.78% B.21% C.50%

16. What happens to nitrogen gas in the atmosphere before it can be used? A.It has to be used up B.It has to be fixed or changed C.It has to be decomposed

17. How much oxygen is in the earth’s atmosphere? A.78% B.50% C.21%

18. When water vapor cools and condenses in the air what is formed? A.Rain B.Clouds C.Snow

19. What do plants make from the nitrates in the soil? A.proteins B.bacteria C.dirt

20. What do solid wastes return to the soil? A.oxygen B.nitrates C.heat

21. What do liquid wastes return to the soil? A.Nitrates B.Ammonia C.Oxygen

22. Water vapor changes to liquid during which stage of the water cycle? A.Precipitation B.Condensation C.Evaporation

23. Water is moved from the atmosphere to the Earth’s surface during what stage of the water cycle? A.Precipitation B.Evaporation C.Condensation

24. What two substances are returned to the soil in animal waste? A.Carbon and Oxygen B.Decay and Waste C.Nitrates and Ammonia

25. What do plants make proteins from? A.Water on the leaves B.Heat from the sun C.Nitrates in the soil

26. What are fossil fuels made from? A.Decayed Organisms B.Rocks in the dirt C.Waste from animals

27. What does burning fossil fuels in cars and factories do to our atmosphere? A.Lessons the amount of carbon dioxide B.Adds more oxygen to the air C.Adds too much carbon dioxide

28. When water droplets in the atmosphere become too heavy to stay in clouds, what stage of the water cycle occurs? A.Evaporation B.Condensation C.Precipitation

29. What stage comes before condensation in the water cycle? A.Evaporation B.Precipitation C.Transfiguration

30. How do chemicals and pesticides get into our groundwater supplies? A.Bug’s wastes B.Through rain C.Decay

31. What 2 things “fix” the nitrogen in the nitrogen cycle? A.Rain B.Lightning and nitrogen fixing bacteria C.Burning fossil fuels

32. What is ammonia a usable form of? A.Oxygen B.Nitrogen C.Carbon Dioxide

33. Where does most (85%) of the carbon dioxide in our atmosphere come from? A.Fossil Fuels B.Carbon factories C.Plants

34. What is one way that the balance of carbon in the air is being set off balance? A.Too many plants B.Burning of fossil fuels C.Not enough plants

35. What cycle do plants use carbon dioxide from the atmosphere? A.Photosynthesis B.Carbon/Oxygen Cycle C.Water Cycle

36. How does a forest fire affect the amount of carbon in the air? A.It kills trees B.It increases the carbon dioxide C.It decreases the carbon dioxide

37. Carbon is stored on Earth in what materials? A.Rocks B.Plants C.Rocks and Fossil Fuels

38. What gas do animals release during respiration? A.Nitrogen B.Oxygen C.Carbon Dioxide

39. What percent of the air is carbon dioxide? A.21% B.78% C.Less than 1%

40. Plants use carbon dioxide and release oxygen during what process? A.Condensation B.Respiration C.Photosynthesis

41. How do animals get most of the nitrogen they need to live? A.By eating plants and plant eating animals. B.By eating dead organisms C.By letting lightning strike them.

42. Which cycle moves H20 through the environment? A.Carbon/Oxygen Cycle B.Nitrogen Cycle C.Water Cycle

43. Which cycle changes a gas into a usable form for plants to use? A.Carbon/Oxygen Cycle B.Nitrogen Cycle C.Water Cycle

44. Which cycle uses plants to turn a gas in the air into a gas that animals can use? A.Carbon/Oxygen Cycle B.Nitrogen Cycle C.Water Cycle

45. What are fossil fuels made from? A.Rocks B.Decayed organisms C.Bacteria

46. Plants and animals use oxygen and release carbon dioxide during what process? A.Transfiguration B.Respiration C.Photosynthesis

47. Plants return water to the environment through what process? A.Stomata B.Evaporation C.Transpiration