Roger Hooke published on the positive feedback present in the erosion of overdeepenings and these entities. Turnbull and Davies described these objects as "often coseismic rock slope failure source area depressions" in a paper disputing the predominant model of slow nivation for their growth. Their rears may feature a randkluft or a bergschrund, and ridges that arise from the convergence of two of them are called aretes, while three or more form 
Roger Hooke published on the positive feedback present in the erosion of overdeepenings and these entities. Turnbull and Davies described these objects as "often coseismic rock slope failure source area depressions" in a paper disputing the predominant model of slow nivation for their growth. Their rears may feature a randkluft or a bergschrund, and ridges that arise from the convergence of two of them are called aretes, while three or more form pyramidal peaks, one of which is the Matterhorn. They are bounded on either side by the headwall and the lip, and they may contain lakes called tarns; those in Scotland are called corries. For 10 points, name these closed-off ends of valleys that form via erosion at the heads of valley glaciers.
Roger Hooke published on the positive feedback present in the erosion of overdeepenings and these entities.
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