Convection & Plate tectonics

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Across
  1. 3. oceanic plate sinking
  2. 6. upper mantle
  3. 8. circular movement
Down
  1. 1. rigid outercrust
  2. 2. a plume of hot material
  3. 4. Heat transfer
  4. 5. radioactive decay
  5. 7. stress that pulls rocks apart