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7th Grade Chapter 5 Lesson 4
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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