Earth

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Across
  1. 3. a boundary where plates move towards each other and collide
  2. 7. The mostly-solid layer of Earth's interior
  3. 9. the study of volcanoes
  4. 10. where two plates move away from each other
Down
  1. 1. The transfer of heat by the circulation or movement of heat in a liquid or gas
  2. 2. a boundary where the plates slide horizontally past each other
  3. 3. the outermost shell of the planet
  4. 4. topographic depressions of the seafloor, relatively narrow in width, but very long
  5. 5. theory explaining the structure of the earth's crust
  6. 6. fluid layer about 2,400 km (1,500 mi) thick and composed of mostly iron and nickel
  7. 8. Where to plates meet