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Ice accumulates in several cracks on mountain sides. Ice exerts pressure on the cracks. Plucking action of ice enlarges the cracks allowing more ice to collect in them. Free-thaw action leads to expansion of cracks making them large basins. Moving ice plucks off loose rock materials from the basin thus enlarging them further. Nivation eats into the back wall of basins making them recede into the mountain side. Steep-sided knife edged ridges are formed separating the basins. Three or more of these ridges converge at the mountain top forming a jagged peak known as a pyramidal peak or horn.
maurice.mutuku answered the question on June 8, 2017 at 08:55
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