Which process primarily carves and deepens fjord valleys formed during glacial periods?

💡 Explanation

When glaciers advance through pre-existing valleys, abrasion and quarrying occur because the immense pressure and ice movement grinds and plucks rock, deepening and widening the valley into a U-shape. Therefore, abrasion results, rather than weathering, dissolution or deposition which have different and more subtle geomorphic effects.

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