When an alpine glacier erodes to the sea then melts, the ocean flooded valley is a(n):

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A fiord is a long, narrow, deep inlet of the sea between cliffs or steep slopes. When an alpine glacier erodes a valley and then melts, the valley may become flooded by the sea, forming a fiord. An arête is a narrow ridge of rock that separates two valleys, a tarn is a small mountain lake, and an esker is a winding ridge of gravel and sand deposited by a meltwater stream flowing beneath a glacier. None of these features are directly related to the flooding of a valley by the sea.

When an Alpine Glacier Erodes to the Sea Then Melts