plate tectonics

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Across
  1. 2. outermost layer of earth’s surface
  2. 4. a volcano that scientists believe will not erupt again
  3. 5. a hole in the earth from which molten rock, gases and ash erupt
  4. 7. thickest layer of earth
Down
  1. 1. plate boundary where plates move away from each other
  2. 3. plate boundary where plates slide past each other
  3. 6. plate boundary where plates move towards each other