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Describe how a pyramidal peak is formed.

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  • Ice accumulates in the pre-existing depressions/hollows on the mountain top.
  • Ice exerts pressure on the hollows.
  • Plucking action of ice enlarges the hollows allowing more ice to accumulate.
  • Freeze and thaw action leads to expansion of the hollows making them large basins called cirques.
  • Nivation acts on the back wall of adjacent basins making them recede into the mountain side.
  • Steep knife edged ridges called arĂȘtes are formed which separate the basins.
  • Three or more of these ridges converge at the mountain top forming a sharp and steep pointed peak called a pyramidal peak.
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