37.Acid rain is the result of which gas or gases (circle)? a. SO2 b. ??2 c. NO d

Question

37.Acid rain is the result of which gas or gases (circle)? a. SO2 b. ??2 c. NO d. All of the above 38.How much of the Earth's surface is covered by water? a. 3/4 b. 1/2 c. 1/3 d. 2/3 39. Ecosystems thrive when introduced to a variety of new organisms. (T or F) 40.Things decompose when they are exposed to a. Air b. moisture c. Insects d. All of the above 41, About 40% of a typical landfill is paper. (T or F) 42.How much of the Earth's land surface is farmable? a. 25 b. 10 c. 33 d. 5 43.How many gallons of water does the average U.S. citizen use per day? a. 50 b. 20 c. 80 d. 5

Explanation / Answer

37. All the above

When sulfer and nitrozen oxides react with water then they forms a mild solution of sulfuric acid and nitric acid. These gases are main cause for Acid rains. They are usually forms high in the clouds.

38. 3/4

39. True

Like alien species, exotic species and non-native species.

40. All the above

41. True

According to the U.S. EPA of the 250 MSW generated in the United States in 2008, 31% was paper.

42. Approximately 10

According to the statistics of 2010, the World Bank reported that about 37.7%of the world’s total land area was considered agricultural land, while approximately 10.6% was considered arable.

43. Nearly 80 gallons

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