Which erosional mechanism primarily shapes the steep U-shaped valleys characteristic of Norwegian fjords?

💡 Explanation

When glaciers advance, glacial abrasion and quarrying sculpt the landscape because the ice's weight and basal meltwater enhance erosion by plucking rocks and grinding the valley floor, resulting in the distinctive U-shape. Therefore, glacial abrasion and quarrying actively modify the landscape, rather than hydraulic action, chemical weathering, or tectonic activity which have slower or different geomorphic signatures over this timeframe.

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