Discussion
According to plate tectonics, the earth's outer shell is divided into
Answer: B
Correct answer: a number of rigid lithospheric plates
The essential idea of plate tectonics is that the lithosphere behaves as a set of rigid plates moving over the weaker asthenosphere, with deformation concentrated at their edges rather than spread through their interiors. That is exactly why earthquakes cluster along narrow belts instead of occurring uniformly - the belts are the plate boundaries.
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