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7th Grade Chapter 5 Lesson 4
 

7th Grade Chapter 5 Lesson 4

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    7th Grade Chapter 5 Lesson 4 7th Grade Chapter 5 Lesson 4 Presentation Transcript

    • 7 th Grade Chapter 5 Lesson 4 Pgs. 178-183 For Student Use Only
    • The Motion of Air
      • Wind- movement of air from one place to another in a horizontal motion.
      • Updraft, Current, and Downdraft- wind moving vertically
      • Wind- has kinetic energy
    • Energy
      • Sun- source of all heating
      • Radiant Energy is converted into kinetic energy (to heat)
      • Earth and Water release heat energy
    • Energy
      • Temperature Factor
        • Winds= a direct result of the temperature differences that exist across the surface of the Earth
        • Different surfaces heat differently
          • Some surfaces reflect light and some absorb light
          • Remember darker surfaces absorb more than lighter surfaces
        • Different areas of the Earth heat differently
          • The angle of the sun is more direct at different areas
    • Heat Energy
      • Albedo- the percentage of radiation that is reflected
      • Color is determined by the amount of light that is reflected
        • Black absorbs colors
        • White reflects all colors
        • Dark heats up more quickly than light
    • Heat Energy
      • Three differences between land and water
        • 1. Water is somewhat transparent but land is not
        • 2. Land is a solid but water is a liquid
        • 3. Water has a much greater heat capacity than land
    • Difference between soil and water
        • 1. Water is somewhat transparent but land is not
          • Radiant energy heats water differently from soil
      • Movie Notes:
        • A Look at How Land Heats up
    • Difference between soil and water
        • 2. Land is a solid but water is a liquid
          • Molecules of solid do not move, but liquids do move and heat up quickly
          • Liquids create convection currents (warm fluids rise and cool fluids sink)
      • Movie Notes:
        • Surface Wind and Convection Currents
    • Difference between soil and water
        • 3. Water has a much greater heat capacity than land
        • - Heat Capacity- a substance is the amount of energy needed to raise its temperature by one degree
      • Movie Notes:
        • Heat Capacity
    • Heat Capacity
      • These differences make different objects heat up differently
        • It is important that water heat up slowly
          • Our bodies are water
          • Our Earth is water