Which process most directly forms narrow, steep-sided fjords along coastlines over geological timescales?

💡 Explanation

When glaciers flow towards the sea, differential glacial erosion occurs creating deep U-shaped valleys because ice erodes softer rock more rapidly, leading to fjords after sea level rise. Therefore, glacial erosion is the direct cause, rather than volcanism, deposition, uplift and weathering which create different geological landforms.

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