Which outcome occurs when glacial melt rate exceeds outflow?

💡 Explanation

A glacial outburst flood occurs when hydraulic head overcomes ice dam strength. The mechanism is hydrostatic pressure; meltwater accumulates because the outflow slows down, therefore pressure rises rather than the normal equilibrium, leading to a sudden release of water.

• Which outcome consistently results from effusive lava eruptions?
• After magma ascends following substantial eruptions, which volcanic structure readily develops due to effusive activity?
• Which risk increases when construction on an alluvial fan restricts sediment flow from upstream?
• Which increased risk occurs when increased pore fluid pressure exists along a fault line near a silicic magma chamber?
• Which risk increases as seasonal flooding deposits alluvial layers upon coastal infrastructure?
• Which depositional pattern develops when a mountain stream abruptly enters a broad, dry valley?