Plate Tectonics Dictionary - Alex Lee

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Across
  1. 5. The point on Earth's surface directly above an earthquake's focus.
  2. 7. The shaking or sudden shock of the ground caused by the movement of the Earth’s outer surface called the crust.
  3. 8. The process by which new oceanic lithosphere is created at mid-ocean ridges as older materials are pulled away from the ridge.
  4. 9. A proposed mechanism for plate motion in plate tectonics.
  5. 11. Forms when one tectonic plate slides beneath another plate at a subduction zone.
  6. 12. An undersea mountain chain where new ocean floor is produced.
  7. 14. The theory that Earth’s lithosphere is broken into enormous slabs, or plates, that are in motion.
  8. 15. The point beneath Earth's surface where rock breaks under stress and causes an earthquake.
  9. 17. Where two tectonic plates move away from each other.
  10. 18. The portion of motion of a tectonic plate that can be accounted for by its subduction.
Down
  1. 1. A weak spot in the crust where magma has come to the surface.
  2. 2. A device used by semiologists to record primary, secondary, surface waves from earthquakes.
  3. 3. The boundary between two tectonic plates that are sliding past each other horizontally.
  4. 4. Convection currents in the mantle that occur because hot rock in the lower part of the mantle is less dense and rises, and cooler rock in the upper part of the mantle cools, becomes denser, and sinks.
  5. 6. Where two tectonic plates move toward each other.
  6. 10. Energy waves that are produced at and travel outward from the earthquake's focus.
  7. 13. The measure of the energy released by an earthquake.
  8. 16. A break in rock along which rock slabs have moved. The shifting of Earth’s tectonic plates can produce a fault, along which earthquakes may occur.