Discuss these charts when students are ready to compare actual data with predictions made. Students should point out that land masses that form over deserts are hot. Air masses from this area push north and east and bring clear, hot, dry weather. A and C bring cold, high pressure moist air. Air masses D and F bring warm, low-pressure, moist air.
Places covered by the same air mass have the same kind of weather.
The temperature and moisture are also about the same. Teacher will demonstrate this experiment for students to learn how air mass is formed. B. Fill 1 bowl with ice. Fill the other bowl with hot water. C. Slip inverted cups over lower end of thermometers and hang over bowls.