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

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    7th Grade Chapter 6 Lesson 3 7th Grade Chapter 6 Lesson 3 Presentation Transcript

    • 7th Grade Chapter 6 Lesson 3
        • Pgs. 207 - 211
        • For Student Use Only
    • 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
    • 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
    • Local Winds
      • Warm Air=
        • Faster molecules
        • More spread out
        • Lower pressure (rises)
      • Cold Air=
        • Slower molecules
        • Close together
        • Higher Pressure
    • 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
    • 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
    • Local Winds
      • Katabatic Winds:
        • Movements of cold air from higher elevations to lower elevations
        • Cool air from mountains rush to fill warmer areas
    • 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