Here's how they form:
* Alpine glaciers are glaciers that form in mountainous regions. They flow down valleys, carving out the landscape as they move.
* As glaciers erode the surrounding mountains, they often carve out cirques (bowl-shaped depressions) on all sides of a peak.
* When these cirques meet, they create a sharp, pointed peak called a horn.
Some famous examples of horns include:
* The Matterhorn in the Alps
* The Grandes Jorasses in the Alps
* The Eiger in the Alps
* Mount Shasta in California, USA
