(19) Surface winds are influenced by several forces, listed below, acting on air
ID: 116821 • Letter: #
Question
(19) Surface winds are influenced by several forces, listed below, acting on air masses except (a) Centrifugal forces b) Frictional forces c) Pressure gradient (d) Kinetic forces (20) Air flow characterized by inward spiraling winds that rotate counterclockwise in the Northern Hemisphere and clockwise in the southern hemisphere is called a) Cyclonic flow b) Anti-cyclonic flow (c) Coriolis (d) Turbulent flow 21) The first air circulation cell on either side of the equator is called (a) Polar cells (b) Ferrel cells (c) Hadley cells (d) Westerlies (22) The boundary between air masses with differing temperature and moisture content is called (a) Surface layer b) Front (c) Boundary layer Air mass (23) An important property that describes the water content of an air parcel is the (a) Density b) Humidity (c) Temperature d) Pressure 24) Which of these is unique for every substance? (a) Density (b) Volume (c) Temperature (d) Pressure (25) What is the relationship between air temperature and air density? (5pts)Explanation / Answer
19] Option c is correct
Wind ultimately comes from temperature differences because, as we learned in another lesson, temperature differences lead to air pressure differences, and air pressure creates convection currents, which, as we just learned, create wind. Let's back up and see how this works. Say we have a warm location, like the equator, and a cold region, like the North Pole. Air at the equator is warmed with more solar energy than the air at the North Pole, so it rises and then moves horizontally toward the North Pole. As it cools, it sinks back down toward the warmer equatorial region. The air pressure difference between the two locations is called the pressure gradient, and the force that actually drives the air from high pressure areas to low pressure areas is called the pressure gradient force.
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