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the BIG idea. CHAPTER OUTLINE. CHAPTER RESOURCES. CHAPTER. NEW CHAPTER. Weather Patterns. Some features of weather have predictable patterns. 16.1. The atmosphere's air pressure changes. 16.2. The atmosphere has wind patterns. 16.3. Most clouds form as air rises and cools. 16.4.

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  1. theBIGidea CHAPTER OUTLINE CHAPTER RESOURCES CHAPTER NEW CHAPTER Weather Patterns Some features of weather have predictable patterns. 16.1 The atmosphere's air pressure changes. 16.2 The atmosphere has wind patterns. 16.3 Most clouds form as air rises and cools. 16.4 Water falls to Earth’s surface as precipitation.

  2. 16.1 The atmosphere's air pressure changes. Air pressure is the force of air molecules pushing on an area. Air pressure decreases as you move higher in the atmosphere. Air pressure can also differ in two locations at the same altitude. air pressure barometer CHAPTER RESOURCES SECTION OUTLINE

  3. VISUALIZATION VISUALIZATION CLASSZONE.COM CLASSZONE.COM Explore how breezes blowing over land and water change over the course of a day. View an animation of the Coriolis effect. 16.2 The atmosphere has wind patterns. Wind blows from areas of high pressure toward areas of low pressure. Earth's rotation causes long distance winds to curve. weather wind global wind Coriolis effect jet stream area of high pressure area of low pressure monsoon CHAPTER RESOURCES SECTION OUTLINE

  4. level where condensation begins 16.3 Most clouds form as air rises and cools. Clouds are made of tiny water droplets that condense from water vapor in rising air. evaporation condensation precipitation humidity saturation relative humidity dew point CHAPTER RESOURCES SECTION OUTLINE

  5. Freezing rain is rain that freezes when it hits the ground or other surfaces. Sleet is rain that freezes into ice pellets while falling through cold air. Snow forms from ice crystals that merge in clouds. Hail forms when ice pellets move up and down in clouds, growing larger as they gain layers of ice. 16.4 Water falls to Earth’s surface as precipitation. Water droplets in clouds merge to form raindrops. freezing rain sleet hail Ice crystals in clouds can form snow, rain, and other types of precipitation. acid rain CHAPTER RESOURCES SECTION OUTLINE

  6. 16.1 The atmosphere's air pressure changes. I. The atmosphere's air pressure changes. air pressure • A. Air exerts pressure. barometer • B. Air pressure is related to altitude and density. • 1. Pressure and Air Motion • 2. Barometers and Air Pressure CHAPTER RESOURCES KEY CONCEPT SUMMARY

  7. 16.2 The atmosphere has wind patterns. II. The atmosphere has wind patterns. weather • A. Uneven heating causes air to move. wind • B. Earth’s rotation affects wind direction. global wind • C. Bands of calm air separate global wind belts. Coriolis effect • 1. Calm Regions jet stream • 2. Wind Belts monsoon • 3. Effects of Wind on Travel • D. Jet streams flow near the top of the troposphere. • E. Patterns of heating and cooling cause local • winds and monsoons. CHAPTER RESOURCES • 1. Local Winds KEY CONCEPT SUMMARY • 2. Monsoons

  8. 16.3 Most clouds form as air rises and cools. III. Most clouds form as air rises and cools. evaporation • A. Temperature affects water in the air. condensation • 1. Water in the Air precipitation • 2. Humidity and Relative Humidity humidity • B. Water vapor condenses and forms clouds. saturation • 1. Characteristics of Clouds relative humidity • 2. Cirrus Clouds dew point • 3. Cumulus Clouds • 4. Stratus Clouds CHAPTER RESOURCES • 5. Fog KEY CONCEPT SUMMARY

  9. 16.4 Water falls to Earth’s surface as precipitation. IV. Water falls to Earth’s surface as precipitation. freezing rain • A. Precipitation forms from water droplets or ice crystals. sleet hail • 1. Measuring Precipitation acid rain • 2. Types of Precipitation • B. Precipitation can carry pollution. CHAPTER RESOURCES KEY CONCEPT SUMMARY

  10. CLASSZONE.COM CHAPTER HOME Chapter Resources Image Gallery Click here to review chapter images and animations Review Game Play a fun interactive review game Animations Link to all the McDougal Littell Science animations Click on the items below to access resources on Resource Centers Get more information on select science topics Audio Readings Hear chapter audio readings Content Review Review key concepts and vocabulary Standardized Test Practice Practice state standardized tests Math Tutorial Review math concepts BACK TO CHAPTER

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