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7th Grade Chapter 6 Lesson 2
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7th Grade Chapter 6 Lesson 2

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    7th Grade Chapter 6 Lesson 2 7th Grade Chapter 6 Lesson 2 Presentation Transcript

    • 7th Grade Chapter 6 Lesson 2
        • Pgs. 198 - 206
        • For Student Use Only
    • Weather vs. Climate
        • There are 4 seasons
          • Summer- Around June 21 is Summer Solstice (day is longest and night is shortest)
          • Fall- Around Sept. 22 is Autumnal Equinox (day and night and equal)
          • Winter- Around Dec. 22 is Winter Solstice (shortest day of year and longest night of the year).
          • Spring- Around March 21 is the Vernal Equinox (day and night are equal)
    • Weather vs. Climate
        • The Seasons:
          • Seasons are caused by tilt of axis
            • Axis- an imaginary line running through the center of the earth
          • Axis is tilted at slight angle to the earth’s plane of revolution about the sun- 23 ½ degree tilt
            • Plane- flat surface like a table top
            • The seasons arise from the tilt of the earth’s axis
          • Solar Year- 365 ¼ days
            • Axis always points to Polaris
    • Weather vs. Climate
      • Rotation vs. Revolution
        • Rotation- one turn around the axis
        • Revolution- one turn around the sun
      • The Seasons:
        • The Hemispheres point towards the sun at different times
        • The Hemispheres seasons are opposite
    • Weather vs. Climate
      • Season Heating Differences
        • Changes in lengths of day and night causes warming and cooling
        • This difference in heating also is caused by temperatures
      • Angle of the Sun
        • Northern Hemisphere leans towards sun in their summer
        • Southern Hemisphere leans towards sun in their summer
    • Weather vs. Climate
      • Spherical Earth
        • Parallels of Latitude:
          • Imaginary lines that run horizontally (think lines on a ladder)
            • 90 degrees North= North Pole
            • 90 degrees South= South Pole
          • Tropic of Cancer: This is located 23.5 North Latitude
            • Sun is direct at this point at our summer
          • Tropic of Capricorn: This is located 23.5 South Latitude
            • Sun is direct at this point at our winter
    • Weather vs. Climate
      • Latitudes
        • Arctic and Antarctic Circle:
          • Arctic Circle- 66.5 north
          • Antarctic Circle- 66.5 south
        • Once sunlight enters atmosphere it bends
        • Band of Twilight
          • Illuminated by scattered or refracted light
        • Winter in tropics- regions lying near equator hardly have winter
    • Weather vs. Climate
      • Latitudes affect how warm or cool areas get
        • Sun never sets on June 21 in Arctic (the land of the midnight sun)
        • Ice and Snow reflect sun back