Which mechanism primarily contributes to the steep walls observed surrounding fjords?

💡 Explanation

When glaciers occupy valleys, glacial plucking and abrasion cause the erosion of the bedrock during periods of ice advance; this deepens and widens the valleys due to direct ice-rock contact and meltwater refreezing within fractures. Therefore, glacial plucking causes steep walls rather than uplift, volcanic activity, or chemical weathering.

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