Which risk increases when tephra accumulation overwhelms lahars?

💡 Explanation

Downstream erosion is significantly increased when heavy tephra deposits mobilize into rapidly flows via mass wasting. This occurs because of the increased sediment load delivered downstream, therefore increasing erosive power, rather than other environmental outcomes.

• Which outcome reduces primary productivity when deep-water upwelling weakens?
• Which geographic effect on regional climate results when a mountain range obstructs prevailing winds?
• Which effect on global CO₂ levels results when El Niño suppresses coastal upwelling?
• Which fluvial consequence results when an alluvial river experiences base-level fall?
• Which outcome primarily follows increased rainfall over poorly draining, sandy soils?
• Which outcome occurs when groundwater exploitation exceeds recharge in an alluvial aquifer?