Here's why:

* Erosion: Horns are formed by the erosive power of glaciers. Glaciers carve out valleys and ridges, and when they meet, they create sharp, pointed peaks called horns.

* Deposition: Deposition plays a role in shaping the surrounding landscape, but it doesn't directly create horns.

How Horns are Formed:

1. Glacial Erosion: Glaciers flow and carve out U-shaped valleys.

2. Convergence: As multiple glaciers erode valleys, they eventually converge at a point.

3. Horn Formation: The intersection of these valleys results in a sharp, pointed peak known as a horn.

Examples of Famous Horns:

* Matterhorn: A famous example in the Swiss Alps.

* The Grand Teton: A prominent peak in the Grand Teton National Park, Wyoming.

So, horns are the product of glacial erosion, not deposition.