Which process initiates rapid outflow of sediment-laden water from glacial outburst lakes?

💡 Explanation

When the water pressure in a glacial lake exceeds the strength of the ice dam, a jökulhlaup initiates because increased water pressure erodes pathways. Therefore, rapid outflow results in a glacial outburst flood rather than rebound, thermokarst, or pyroclastic melt, which require entirely different geomorphic mechanisms.

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