31. This holds a planet's atmosphere close to its surface:
32. During the afternoon the greatest temperature difference between the surface air and the air several meters above occurs on a:
33. Ideal conditions for a strong radiation inversion:
34. Example of primary pollutant
35. In a photochemical smog, which gas is an eye and mucous membrane irritant?
36. _________ element had guided the earlier navigators to keep them on right path.
37. Heat is energy in the process of being transferred from:
38. Which one is true?
39. A population is a group of
40. Rising air cools by this process:
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