Formation of hotspots

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1. Why can some older volcanic islands become inactive

  • They eroded by the sea
  • The plume from hot spot is stationary but the plate with the island moves so isn't fed new magma
  • The plume stops and no more magma rises
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2. What are created soon as a result of submarine volcanic eruptions

  • Island Arcs
  • Seamounts
  • Islands

3. What happens to older inactive islands

  • Get attcked by marine erosion and fall below sea level as seamounts
  • Nothing
  • They eventually fall into the sea

4. Why is heat generated at the outer core/ mantle boundary

  • Possibly due a concentration of radioactive elements
  • Heat from the Sun
  • Heat from the core
  • Thermal currents

5. Where can a hotspot create plumes

  • Close to or on plate margins
  • Close to and on plate margins and in the centre of plates
  • In the centre of plates (Intra Plate)


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