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SECTION WEATHER CHANGES AS AIR MASSES MOVE. 3.1 Reinforcing Key Concepts BIG IDEA The interaction of air masses causes changes in weather. KEY CONCEPT Weather changes as air masses move. 1. Air masses are large bodies of air. An air mass forms when air over a large region of Earth sits in one place for many days. The air gradually takes on the characteristics of the land or water below. In the chart, record whether each air mass forms over land or water and whether each air mass forms near to or far from the equator. Air Mass Forms over land or water? Forms near to or far from the equator? Maritime Polar Maritime Tropical Continental Polar Continental Tropical Different types of fronts produce different patterns of weather. An interaction between two fronts is shown in the diagram below. 2. Weather changes where air masses meet. a. _________________ a. Is air mass a a warm air mass or cold air mass? b. Is air mass b a warm air mass or cold air mass? c. How b. _________________ does this front look different from the other types of fronts? d. What kinds of clouds will form at this front? Why do these clouds form? Copyright © by McDougal Littell, a division of Houghton Mifflin Company CHAPTER 3 Weather Fronts and Storms Warm Front 164 EARTH’S ATMOSPHERE, CHAPTER 3, REINFORCING KEY CONCEPTS 164-164-sean-urb-d0301-rkc 164 3/4/04, 4:52:59 PM
