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← GeographyWhich impact on communities occurs during lahar flows?
A)Enhanced soil mineral composition downstream
B)Widespread infrastructure and building destruction✓
C)Increased biodiversity in riparian zones
D)Formation of new arable farmland upstream
💡 Explanation
Lahar flows, mixtures of volcanic ash, debris, and water, undergo sediment transport, therefore causing widespread infrastructure destruction because they can bury or sweep away structures. This is rather than improving soil or biodiversity, which are not characteristic effects of lahar passage.
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