Drill: What causes wind?. Section 1 Air Masses Chapter 24 Objectives Explain how an air mass forms. List the four main types of air masses. Describe how.
Chapter 2 Weather Factors Section 3 Winds. What causes wind? Wind: The horizontal movement of air from an area of high pressure to an area of lower pressure.
Warm Up 3/31/08 1.True or False: More water vapor can exist in warm air than cold air. 2.Explain briefly how wind forms. 3.What are low, sheetlike clouds.
