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Geo: Chapter Three, Section One

Geo: Chapter Three, Section One



Chapter Three, Section One

Chapter Three, Section One



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    Geo: Chapter Three, Section One Geo: Chapter Three, Section One Presentation Transcript

    • Chapter Three, Section One Seasons and Weather
    • What causes the changing seasons?
      • Earth revolves around sun
      • Earth’s tilt (23.5 degree angle) allows a more direct line to sun’s rays
      • As Earth continues to move, location becomes either further or closer to direct line with sun
      • Amount of sun affects atmospheric pressure, temperature, rainfall, hence we have our distinct seasons
    • Where are the tropics?
      • Tropic of Cancer - northern tropic
      • Tropic of Capricorn - southern tropic
      • Solstice : the day on which sun’s rays shine directly overhead at noon at either Tropic
      • Summer solstice--longest day of year
      • Winter solstice--shortest day of year (depending on where you live)
      • Equinox : biannual times when days and night all over the world are equal in length
        • Equinoxes mark the beginning of spring and autumn
    • What is the difference between weather and climate?
      • Weather : condition of atmosphere at a particular location and time
      • Climate : term for weather conditions at a particular location over a long period of time
    • What causes weather?
      • Many conditions affect weather:
        • Amount of solar energy
        • Water vapor: cause precipitation
        • Cloud cover: hold water vapor
        • Landforms and bodies of water
        • Elevation: as increase, air is thinner, less able to hold moisture
        • Air movement: winds
    • Is all Precipitation the same?
      • NO, DUH!!!!
      • 1) Convectional: characteristic to hot climates; morning sunshine heats warm moist air; clouds form in afternoon, rain falls
      • 2) Orographic: characteristic of mountain areas; storms drop rain on windward side of mountain, creates rain shadow on leeward (opposite) side; the rain shadow effect
      • 3) Frontal: characteristic of mid-latitude frontal storms; cold dense air push lighter warmer air upward, causing precipitation to form
    • Weather Extremes
    • Hurricanes
      • Storms that form over warm, tropical ocean waters
      • Also called: in Asia - typhoons; in Australia - tropical cyclones, willy-willies; in the Philippines - baguios; in Mexico - chubascos
      • Places where ocean water temperature is 80 degrees or higher, huge amounts of moisture and heat energy is picked up.
      • Water-laden (or filled) winds flow into core, or “eye”
      • The “eye” can be 10 to 20 miles across and has clear, calm skies
      • Winds around eye can be as strong as 200 miles per hour
      • Clouds and winds can stretch over large areas, up to 500 miles
      • Low-lying coastal areas are vulnerable
    • Tornadoes
      • Form quickly, without warning
      • Also known as a twister, powerful funnel-shaped column of spiraling air
      • Cold, dry air collides with warm, moist air
      • Winds swirl counter-clockwise around low-pressure center
      • Winds may read 300 mph
      • Usually flat plain areas are vulnerable
      • Tornado Alley: midwest US
    • Blizzards
      • Common in Senegal, chuckle, chuckle
      • Heavy snowstorm with high winds (35 mph)
      • Some parts of US are frequently hit with snowstorms - snowbelts around Great Lakes
    • Droughts
      • Long period of time without rain or with very minimal rainfall
      • 1930s in US --dust bowl
    • Floods
      • Water spreads over land not normally covered
      • Can be from melting snow, rainwater filling small streams, overflowing rivers
    • Chapter 3, Section 1
      • What did we learn?
      • Now: video time
      • Homework: 1) blog 2) pre-reading for Tuesday: page 54 - 58 3) worksheets: page 8 and 9