my understanding of plate tectonics

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Across
  1. 3. = the outer layer of the Earth
  2. 4. = Stationary magma plume causing volcanism away from plate edges
  3. 5. = the centre peice of earth
  4. 6. = 2 plate tectonics move towards eachother
  5. 8. = the second to last layer of the Earth
Down
  1. 1. = 2 plate tectonics moving away from eachother
  2. 2. = Area where an oceanic plate sinks into the mantle.
  3. 7. = 2 plate tectonics shift from side to side