Consider the following statements about air pressure and choose the correct option. (A) On the moon there is no air and hence no air pressure. (B) Variation of temperature causes pressure differences in the atmosphere. (C) Air always moves from high pressure areas to low pressure areas.

Near sea level, the average rate of decrease of atmospheric pressure with altitude is approximately 1 millibar (mb) for every elevation gain of:

Consider the following statements about air pressure and choose the appropriate option. (A) On the moon, there is no air and hence no air pressure. (B) Variation of temperature causes pressure differences in the atmosphere. (C) Air always moves from high-pressure areas to low-pressure areas.