1. Horns form through head ward erosion of the cirque walls; If three or more radiating glaciers cut headward until their cirques meet, horns form2. The divides between cirque side walls or head walls get narrow because of progressive erosion and turn into serrated or saw-toothed ridges sometimes referred to as arêtes with very sharp crest and a zigzag outline

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1. 1. Horns form through head ward erosion of the cirque walls; If three or more radiating glaciers cut headward until their cirques meet, horns form
2. The divides between cirque side walls or head walls get narrow because of progressive erosion and turn into serrated or saw-toothed ridges sometimes referred to as arêtes with very sharp crest and a zigzag outline
Image: Horns and Serrated Ridges