1.2 Convection Currents and the Mantle



Vocabulary



heat transfer: the movement of energy from a warmer object to a cooler object
radiation: the transfer of energy through empty space
conduction: heat transfer by direct contact of particles of matter
convection: heat transfer by the movement of a heated fluid
density: measure of how much mass there is in a volume of a substance
convection current: flow that transfers heat within a fluid


Outline


Radiation

  • Transfer of energy through empty space
    • sunlight

Conduction

  • heat transfer by direct contact of particles of matter
    • soup heats spoon
    • hand melts snow

Convection

  • heat transfer by the movement of fluids
    • caused by different temperature and density
      • rock is more dense than water
    • when fluid is heated particles move faster
      • density decreases
    • convection current
      • warm soup rises to top and cools
      • gravity pulls it down and becomes heated

Convection in Earth's Mantle

  • convection currents flow in asthensophere
    • have been there over four billion years
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