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← GeographyWhich consequence results when crustal hydration during subduction weakens sediment?
A)Enhanced magma viscosity at volcanoes
B)Increased frequency of megathrust earthquakes✓
C)Reduced rate of mantle convection
D)Decreased formation of island arcs
💡 Explanation
Increased crustal hydration generates weak sediments near subduction zones, therefore seismic locking decreases and triggers larger, megathrust earthquakes via stick-slip mechanism; rather than suppressed volcanism or impacts to convective flows further down.
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