Question: What features does a mountain valley that has been glaciated have that an unglaciated valley lacks? Need Assignment Help? Check all that apply. View Available Hint(s)for Part A Small lake called a cirque, which forms inside an erosional structure called a tarn. V-shaped valley Triangular-shaped cliffs called truncated spurs. Pyramid-shaped peak called an arête, typically formed by the meeting of three ridges called horns. Pyramid-shaped peak called a horn, typically formed by the meeting of three ridges called arêtes.