What observation supports the hypothesis that the slab-pull force is the primary cause of plate motion?
A) Divergent plate boundaries represent all of the upwelling expected by mantle convection.
B) Plumes are the deep upwelling component of convection with seismically slow velocities.
C) Earthquakes and volcanoes are concentrated at plate boundaries.
D) Plates with long subduction zones move faster than plates with short subduction-zones.
Answer: D
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