31. At the North Pole the sun will rise above the horizon on ____ and set below the horizon on ____.
32. World Water Day is celebrated on ___________
33. A pond, serves as a good example for a __________ water ecosystem.
34. What is lentic habitat ?
35. Minamata disease is caused by
36. The planet with a strong greenhouse effect, whose surface temperature averages 480oC (900oF) is:
37. Official date of Earth Day is on _________
38. Name the disease caused by mercury poisoning in Japan
39. The Chipko movement is started by
40. The change of state of ice into water vapour is known as:
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