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← GeographyWhich risk increases when a descending oceanic plate accumulates volatile-rich sediments along a subduction zone?
A)Earthquake frequency and rupture magnitude✓
B)Shallower average ocean water salinity
C)Enhanced carbon sequestration rates locally
D)Glacial advance in nearby regions
💡 Explanation
Seamounts increase earthquake risk at subduction boundaries because increased pore fluid pressure results from volatile release. The mechanism, effective stress reduction, amplifies fault slip area and magnitude, therefore raising earthquake hazard, rather than other hydrological-related effects.
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