Final answer:
Pyramid-like peaks sculpted by valley glaciers are referred to as horns. They are formed by the erosion of multiple glaciers on different sides of a peak, resulting in sharp and steep features. This type of erosion is responsible for some of the most dramatic and beautiful mountain landscapes on Earth, such as the Torres del Paine and the Tassili plateau.
Step-by-step explanation:
Pyramid-like peaks that have been sculpted by valley glaciers are referred to as horns. These horns are formed when three or more glaciers erode separate sides of a peak, which can dramatically reshape the landscape. Glaciers are powerful agents of erosion and can carve out stunningly steep and sharp features in the mountains. For example, the Torres del Paine in Chile and the Tassili plateau in Algeria, often described as "forests of stone", exhibit geological formations that result from the activity of ice and water erosion.
Valley glaciers begin in a cirque at the head of a valley or in a plateau ice cap, and flow downward, carving U-shaped valleys between mountain walls. This process also leads to the formation of moraines, which are accumulations of rock and soil debris left behind by receding glaciers. The Aletsch glacier in Switzerland, for instance, has left a clear imprint on the landscape with its accumulation of rocks and boulders.
The erosive power of ice is particularly evident in the delicate balancing of boulders and the polished surfaces of rock faces. Mountains undergo substantial change over time due to the continual forces of erosion at work, altering their original appearance to one that is much more rugged and dramatic. Thus, the name used for pyramid-like peaks sculpted by valley glaciers is horn.