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 ?. 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. Answer - d) Although SO2 (Sulfuric acid) and NOx ( Nitric acid) are mainly responsible for acid rain, CO2 also forms weak Carbonic acid and contributes to acid rain.

38. Answer - a) 3/4 th of the Earth's surface is covered by water.

39. Answer - True - A healthy ecosystem has lots of species diversity. However, a word of caution here, if the introduced species are invasive, then it tends to either replace species or reduce the overall diversity altogether.

40. Answer - d) Air if comprises of bacteria and various gases that act as decomposers. Moisture hastens the decomposition process. Insects like Termites, Maggots etc are saprophytes and act as decomposing agents.

41. Answer - True

42. Answer - c) Around 1/3rd of the Earth's land surface or 33% is farmable

43. Answer - c) 80 gallons per day

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