During the last ice age, ice forms on the side of the mountain., The ice builds and begins to form a glacier., The ice is now a fully formed glacier., Plucking happens at the back of the glacier on the corrie wall., Abrasion occurs at the base of the glacier., The corrie is fully formed now, a wide and deep hollow on the side of the mountain., The glacier lurches forward at the front and begins to move down the mountain., After the ice age, the glacier melts and leaves behind a small lake called a tarn..

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