Why are winds blowing over mountains generally stronger than winds blowing at the same level on either side?
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ANSWER: When wind meets a barrier, it exerts a force upon it. If the barrier doesn’t move, the wind moves around, up, and over it. As stable air flows over a ridge, it increases in speed. Thus, winds blowing over mountains tend to be stronger than winds blowing at the same level on either side. In fact, one of the greatest wind speeds ever recorded near the ground occurred at the summit of Mt. Washington, New Hampshire, elevation 1909 m (6262 ft), where the wind gusted to 201 knots (231 mi/hr) on April 12, 1934. A similar increase in wind speed occurs where air accelerates as it funnels through a narrow constriction, such as a low pass or saddle in a mountain crest.
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What is meant by the demographic transition? Relate the epidemiologic transition and fertility transition (two elements of demographic transition) to its four phases
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