• Earthquakes at convergent plate boundaries mark the location of the subducting lithosphere.
  • The motion of the lithosphere as it plunges through the mantle causes the quakes.
  • At greater depths, the plate heats up enough to deform plastically.
  • Subduction zones around the Pacific Rim are responsible for many of the world's earthquakes.
  • The Pacific Northwest of the United States is at risk from a potentially massive earthquake.
  • The collision of two continents also creates massive earthquakes in the Himalayan Mountains.
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