The pyramidal peaks that form when several cirques chisel a mountain form three more sides are called

horns
cirques
aretes
medial moraines

The answer is A. horns.

A horn is a pyramidal peak formed by the intersection of three or more cirques. Cirques are steep-walled amphitheaters carved out by glaciers. As the glacier moves down the mountain, it erodes the rock, creating a bowl-shaped depression. The cirque walls are often very steep, and the floor of the cirque is usually filled with talus, which is a loose accumulation of rocks and boulders.

When several cirques form on a mountain, they can intersect to create a horn. Horns are often very sharp and pointed, and they can be very dangerous to climb. However, they are also very beautiful, and they are a popular destination for mountaineers.

Here is a brief explanation of each option:

  • A horn is a pyramidal peak formed by the intersection of three or more cirques.
  • A cirque is a steep-walled amphitheater carved out by glaciers.
  • An arete is a sharp ridge formed by the intersection of two cirques.
  • A medial moraine is a ridge of debris that forms in the middle of a glacier.
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