Chapter 8, Responses to Review Questions ______________________________________________________________________________ 1. In large-scale weather systems, the vertical component of the wind is typically considerably weaker than the wind's horizontal component. 2. Horizontal gradients in air pressure arise from horizontal gradients in air density, which in turn result from differences in air temperatures (chiefly) or humidity. 3. All other factors being equal, the wind speed increases as the horizontal air pressure gradient becomes steeper. Where there is no horizontal air pressure gradient, the air is calm. 4. The reversal in direction of Coriolis Effect between the Northern and Southern Hemispheres stems from the contrast in our perspective of Earth's rotational direction in the two hemispheres. To an observer at the North Pole, Earth appears to rotate in a counterclockwise direction whereas to an observer at the South Pole, Earth appears to rotate in a clockwise direction. 5. Cold-air drainage is an example of how gravity influences the motion of air.
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