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← GeographyWhich risk increases when Mount Rainier explosively erupts?
A)Catastrophic lahars in river valleys✓
B)Glacial ice sheet destabilization rapidly
C)Seismic swarm induced building collapse
D)Acid rain from sulfates increase drastically
💡 Explanation
A tephra eruption deposits ash promoting lahars, because Volcanic ash mixes with snow/ice destabilizing slopes producing mudflows via gravitational flows. Therefore, lahars increase rather than seismic collapse, because tephra increases load but doesn't directly cause the effect.
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