Volcano

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Across
  1. 5. tectonic zone where plates move away from each other
  2. 8. a mountain or hill, typically conical, having a crater or vent through which lava, rock fragments, hot vapor, and gas are being or have been erupted from the earth's crust
  3. 10. the study of earth
  4. 12. tectonic zone where oceanic plates sink below continental plates
Down
  1. 1. A current where molecules rise over a heat source and sink as they cool
  2. 2. become active and eject lava ash and gases
  3. 3. hot molten or semifluid rock erupted from a volcano
  4. 4. the outermost shell of a terrestrial planet
  5. 6. melted mass of geological materials
  6. 7. tectonic zone where plates moving toward each other
  7. 9. preserved remains of life from a past geological age
  8. 11. solid mass of geological materials