Assign 8.7 Earthquakes

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Across
  1. 3. Mantle plumes of hot rock that rise through the mantle
  2. 6. Boundaries where the two plates move toward each other.
  3. 7. The fastest seismic wave
  4. 9. The edges where two plates meet.
  5. 12. Movement of the plates over Earth's surface is termed plate _______.
  6. 13. This layer of the Earth is mostly iron metal and makes up about 31% of the Earth
  7. 15. Composed of both the crust and the portion of the upper mantle that behaves as a brittle, rigid solid
  8. 16. This Earth layer is less than 1% of Earth by mass.
Down
  1. 1. partially molten upper mantle material that behaves plastically and can flow
  2. 2. Boundaries where the two plates slip past each other.
  3. 4. Geologist that proposed that the continents were once united into a single supercontinent
  4. 5. Boundaries where the two plates move away from each other.
  5. 8. This process occurs at oceanic trenches and when an oceanic plate meets a continental plate.
  6. 10. This layer of the Earth is hot, ultramafic rock and represents about 68% of Earth's mass
  7. 11. The point on the Earth's surface directly above the place where the earthquake occurs
  8. 14. These seismic waves cannot travel through liquid.