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← GeographyWhich ecosystem effect occurs at high tephra fallout?
A)Waterway siltation and habitat smothering✓
B)Increased solar radiation absorption
C)Enhanced nitrogen fixation in soils
D)Decreased albedo from surface darkening
💡 Explanation
High tephra fallout smothers aquatic habitats because increased suspended sediment from waterway siltation reduces light penetration harming photosynthesizers. The stream is now uninhabitable, therefore siltation is the effect, rather than changing nutrient levels or reflectivity.
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