The land air is warmer and less dense so it rises

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and replaces the rising land air. The land air is warmer and less dense so it rises, then the rising land air becomes cooled. Moisture condenses, forming clouds and rain and then the colder air is denser so it sinks. So in Figure 15.5 the windward side of the mountain range the moisture in the air becomes dense and sinks back down into the lowlands. 15.8. Why are nights in arid lands surprisingly cold? Hint: Think of a feature of the atmosphere that holds daytime heat during the night. Answer: Nights in arid lands are surprisingly cold because when the clouds that trap the heat vanish so does the warm air. The land surrounding this area is vacant so when the sun vanishes so does the heat from the sun because there is nothing to hold it in place. 15.14. What is the prevailing wind direction indicated by the barchan dunes in Figure 15.14? Answer: From west to east 15.16. Notice in Figure 15.14 that some of the dunes are not perfectly symmetrical like that shown in Figure 15.13. (A) Describe this asymmetry, and (B) try to explain it. Hint: Study the caption to Figure 15.13A. Answer: The sand dunes provided in the figure are barchans dunes and are crescent- shaped. These dunes are created by the direction of the winds. The symmetry is produced by a continuous flow of sand. A constant wind direction produces a dune that is symmetrical.
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  • Winter '13
  • ChrisLee
  • Geology, wind direction, Barchans dunes, Land Air

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