A peak is a sharp-pointed mountain. It has been sharpened by frost shatter over hundreds of thousands of years. Peaks are always found in places which have not been buried by ice in the Ice Age. This picture shows the most famous peak of all. It is in Switzerland and is called the Matterhorn. During the ice Age this peak stood above the ice, so it continued to become shattered by frost.

Peaks can only form where the rock is hard. If the rock is soft, then the peak would soon crumble away.

The frost-shattered rock falls away in sharp-sided blocks. You can see what they look like in the video below.