Which event rapidly alters river drainage basins when a stratovolcano erupts tephra?

💡 Explanation

Increased sediment deposition occurs because lahars form when tephra mixes with meltwater and debris; this rapidly overwhelms existing drainage systems. Therefore, river courses change, rather than CO₂ fluctuations, albedo changes or groundwater reduction.

• Which outcome occurs when pyroclastic flow interacts cryosphere environments?
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• Which mechanism accelerates headwall erosion within a glacial cirque containing a bergschrund?
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