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7th Grade Chapter 6 Lesson 3
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7th Grade Chapter 6 Lesson 3

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  • 1. 7th Grade Chapter 6 Lesson 3
      • Pgs. 207 - 211
      • For Student Use Only
  • 2. Local Winds
    • Wind:
      • Horizontal movement of air
    • Vertical Movement of Air:
      • Current, updraft, or downdraft
        • Upward air- ascending
        • Downward air- subsiding
    • Air heats by: Conduction
      • The DIRECT transfer of heat from one object to another
  • 3. Local Winds
    • Local Wind- wind movement in a smaller area
    • Heat is transferred from molecule to molecule
      • Cold ground and cold air have little heat to pass on
      • Air can help control the temperature of a region
      • Air can be warm or cool
    • Air travels:
      • Air always goes from an area of high pressure to an area of low pressure
  • 4. Local Winds
    • Warm Air=
      • Faster molecules
      • More spread out
      • Lower pressure (rises)
    • Cold Air=
      • Slower molecules
      • Close together
      • Higher Pressure
  • 5. Local Winds
    • Water and Land:
      • Sea breezes (or lake breezes) bring cool air during the day
        • Cool air from the water rushes to fill the area where the hot land air rose
    • Woods:
      • Forest breeze
        • Cool air from under the tress rushes to fill the area where there are no trees and the land is warm and air is rising
  • 6. Local Winds
    • Valley Breeze:
      • Day: Breeze blows up from the valley
        • Mountains peaks warm more quickly than the valley
        • Cool air rises up to the warm mountain from the cool valley
    • Mountain Breeze:
      • Night: Breeze blows from the mountain
        • Valley cools very slowly, mountain cools quickly
        • Air goes from cooler area to warmer area
  • 7. Local Winds
    • Katabatic Winds:
      • Movements of cold air from higher elevations to lower elevations
      • Cool air from mountains rush to fill warmer areas
  • 8. Local Winds
    • Foehn (Alps) and Chinook (Am. Rockies):
      • Gusty winds caused by cold air seeking an area of warm air
        • Windward: side of mountain facing wind, warm air gets forced up the mountain and creates clouds (as air gets cooler) (Note: Condensation helps air stay warm)
        • Leeward: side of the mountain facing away from wind: warm air that is now drier blows over surface and brings warmer, dry air to leeward side