Kettle moraine refers to a glacial landform consisting of a series of small hills and depressions formed by the deposition of till around stagnant blocks of ice. As the ice melts, kettle holes form, creating a hummocky landscape. Kettle moraines are important in understanding glacial deposition and post-glacial landscape development.
Reference: Easterbrook, D. J. (1999). “Surface Processes and Landforms.” Prentice Hall.