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Passage: Glacial melt in northern Pakistan has accelerated in recent decades, initially increasing river flow but raising long-term concerns about future water supply once the glaciers substantially shrink. Scientists also warn of glacial lake outburst floods, sudden and destructive events triggered when meltwater breaches natural ice or debris dams. Monitoring systems have been installed in several high-risk valleys to detect early warning signs. Question: According to the passage, what is a glacial lake outburst flood?
A. A flood caused by dam construction failures
B. A sudden flood caused by meltwater breaching a natural dam ✅
C. A yearly seasonal flood from monsoon rain
D. A slow, gradual rise in river levels
