Which mechanism creates ribbon lakes within a glacial valley after ice retreat?

💡 Explanation

When glaciers retreat from valleys, differential erosion occurs because variations in bedrock resistance lead to deeper hollows being carved by basal drag, which then fill with meltwater and precipitation, creating ribbon lakes. Therefore differential erosion is the correct mechanism, rather than moraine damming, isostatic rebound or volcanic processes.

• Which consequence develops when intense rainfall saturates unconsolidated tephra deposits?
• Which geologic outcome occurs when a river's slope abruptly decreases at the base of a mountain range?
• Which risk increases when seasonal thawing weakens permafrost integrity?
• Which mechanism causes localized ocean acidification within a subtropical gyre's convergence zone?
• Which risk significantly increases along major river valleys adjacent to volcanic areas following substantial pyroclastic flows?
• Which outcome primarily results in arid landscapes downstream of large alluvial fans due to water management?