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In high altitudes and latitudes, glaciers act as powerful erosional agents. Singh describes cirques, arêtes, U-shaped valleys, and fjords as classic glacial erosional forms, while moraines, drumlins, and eskers represent deposition. The periglacial realm (cold but non-glaciated) produces unique features like patterned ground, pingos, and solifluction lobes—critical for understanding high-altitude regions like the Himalayas and Tibet. geomorphology savindra singh pdf verified