6th grade Ch. 1 Sec. 2 Convection Currents & the Mantle

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6th grade Ch. 1 Sec. 2 Convection Currents & the Mantle

  1. 1. Ch. 1 Sec. 2 Convection & the Mantle YouTube video-Bill Nye Heat
  2. 2. Heat transfer <ul><li>movement of energy from warmer object  cooler object </li></ul><ul><li>3 types : </li></ul>1. radiation thru. empty space no direct contact 2. conduction by direct contact 3. convection movement of a heated fluid (liquids & gases)
  3. 3. convection currents: <ul><li>flow that transfers heat within a fluid </li></ul><ul><li>form by: </li></ul><ul><ul><li>When a fluid is heated, its density decreases. </li></ul></ul><ul><ul><li>When a fluid cools, its density increases. </li></ul></ul>changes in a fluid’s density force of gravity heating & cooling of a fluid
  4. 4. 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
  5. 5. <ul><li>A lava lamp demonstrating </li></ul><ul><li>convection in the mantle. </li></ul>
  6. 6. examples of heat transfer conduction
  7. 7. Convection & Conduction
  8. 8. In conduction, the heated particles of a substance transfer heat to other particles through direct contact.
  9. 9. Remember: <ul><li>Heat goes higher . </li></ul><ul><ul><li>Hot air, hot water, and hot rock </li></ul></ul><ul><ul><li>all tend to rise. </li></ul></ul><ul><li>Cold creeps lower. </li></ul><ul><ul><li>Cold air, cold water, and cool rock </li></ul></ul><ul><ul><li>all tend to sink. </li></ul></ul>
  10. 10. Were you paying attention ???
  11. 11. <ul><li>What are the three types of heat transfer? </li></ul>
  12. 12. <ul><li>Radiation </li></ul><ul><li>Conduction </li></ul><ul><li>Convection </li></ul>
  13. 13. <ul><li>Describe how convection currents form. </li></ul>
  14. 14. <ul><li>The heating and cooling of a fluid </li></ul><ul><li>Changes in a fluid’s density </li></ul><ul><li>Force of gravity combine to set convection currents in motion </li></ul>
  15. 15. <ul><li>What happens to convection currents when a fluid reaches a constant temperature? </li></ul>
  16. 16. <ul><li>When a fluid reaches a constant temperature, the convection currents stop. </li></ul>STOP

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