A sharp-edged glacially eroded ridge is called as:

Question

Accepted Answer

An arete is indeed a sharp-edged, glacially eroded ridge. Here's why Option 4 is the correct answer and why the others are incorrect:

*   **Option 4: Arete (Correct)** An arete is formed when two glaciers erode parallel U-shaped valleys. The ridge between these valleys becomes a sharp, narrow, and often jagged ridge due to the glacial erosion on both sides. This is a classic feature of glaciated mountain landscapes. The key characteristic is the sharp edge resulting from glacial erosion on *both* sides.

*   **Option 1: Col (Incorrect)** A col is a saddle-shaped pass or depression between two mountain peaks, often formed by glacial erosion lowering a ridge. While glaciers can contribute to the formation of a col, it's not primarily defined as a sharp-edged ridge itself. It's a low point *between* ridges or peaks.

*   **Option 2: Roche Moutonnee (Incorrect)** A roche moutonnee is an asymmetrical rock formation shaped by glacial ice. It has a smooth, gently sloping (stoss) side where the glacier flowed over it and a steeper, plucked (lee) side where the glacier pulled away. It's a rock formation, not a ridge, and doesn't have the sharp-edged characteristic of an arete.

*   **Option 3: Horn (Incorrect)** A horn is a sharp, pyramid-shaped peak formed by the headward erosion of three or more cirque glaciers. While the ridges leading up to a horn can be aretes, the horn itself is the peak, not a ridge. The aretes are the *edges* leading to the horn.