plate tectonics

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Across
  1. 2. Molten rock beneath the Earth's surface
  2. 3. The rigid outer layer of the Earth, broken into tectonic plates
  3. 5. A sudden glacial flood caused by a glacier on top of or near a volcano melting due to the heat from the eruption
  4. 6. The force due to the weight of a subducting plate, aiding movement (4,4)
  5. 7. A mixture of gases and rock fragments, at high temperatures travelling at rapid speeds (11,4)
  6. 8. The upper mantle layer of the Earth. It is semi-molten and approximately 2000km wide
  7. 9. The process of one plate sinking beneath another at a convergent plate boundary
  8. 10. A high-temperature, low-viscosity magma type
Down
  1. 1. A region of the subducting plate where most destructive margin earthquakes originate (7, 4)
  2. 2. The boundary between the crust and the mantle
  3. 4. The study of past changes in the Earth's magnetic field, evidence for seafloor spreading
  4. 11. A flow of mud and debris