Formation of hotspots

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1. How are new volncaic islands formed

  • Build up of debris
  • Plume is continous so eruptions are frequent, seamounts eventually build up enough to reach the surface
  • Plates rising from under the sea
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2. 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

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. 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)

5. What are created soon as a result of submarine volcanic eruptions

  • Seamounts
  • Islands
  • Island Arcs


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