Which mechanism causes differential erosion rates along the walls of a fjord during glacial retreat?

💡 Explanation

When a glacier retreats, differential erosion occurs because zones of varying lithology and fracture density within the fjord walls respond differently to weathering and erosion, causing uneven removal of rock. Therefore variations rocks and fractures result, rather than mechanisms related sea level, precipitation, or solar irradiance that affect the entire landform more uniformly.

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