7th grade Ch. 1 Sec. 2 Convection Currents & the Mantle
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7th grade Ch. 1 Sec. 2 Convection Currents & the Mantle

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7th grade Ch. 1 Sec. 2 Convection Currents & the Mantle 7th grade Ch. 1 Sec. 2 Convection Currents & the Mantle Presentation Transcript

  • Ch. 1 Sec. 2 Convection & the Mantle YouTube video-Bill Nye Heat
  • Heat transfer
    • movement of energy from warmer object  cooler object
    • 3 types :
    1. radiation thru. empty space no direct contact 2. conduction by direct contact 3. convection movement of a heated fluid (liquids & gases)
  • convection currents:
    • flow that transfers heat within a fluid
    • form by:
      • When a fluid is heated, its density decreases.
      • When a fluid cools, its density increases.
    changes in a fluid’s density force of gravity heating & cooling of a fluid
  • Convection in Earth's Mantle Heat from Earth’s core & mantle cause convection currents to form in asthenosphere  Hot columns of mantle rise thru asthenosphere  At top of asthenosphere, hot material spreads out  Pushes cooler material out of way  Cooler material sinks back into asthenosphere
    • A lava lamp demonstrating
    • convection in the mantle.
  • examples of heat transfer conduction
  • Convection & Conduction
  • In conduction, the heated particles of a substance transfer heat to other particles through direct contact.
  • Remember:
    • Heat goes higher .
      • Hot air, hot water, and hot rock
      • all tend to rise.
    • Cold creeps lower.
      • Cold air, cold water, and cool rock
      • all tend to sink.
  • Were you paying attention ???
    • What are the three types of heat transfer?
    • Radiation
    • Conduction
    • Convection
    • Describe how convection currents form.
    • The heating and cooling of a fluid
    • Changes in a fluid’s density
    • Force of gravity combine to set convection currents in motion
    • What happens to convection currents when a fluid reaches a constant temperature?
    • When a fluid reaches a constant temperature, the convection currents stop.
    STOP