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2. Why is magma created as the plume rises

  • Due to a fall in pressure (decompression melting)
  • The lithosphere melts
  • Its already there

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

  • Island Arcs
  • Seamounts
  • Islands

4. 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

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

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