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kame	A stratified sequence of lateral-moraine sediment that’s sorted by water flowing along the edge of a glacier.
karst landscape	A region underlain by caves in limestone bedrock; the collapse of the caves creates a landscape of sinkholes separated by higher topography, or of limestone spires separated by low areas.
kerogen	The waxy molecules into which the organic material in shale transforms on reaching about 100°C. At higher temperatures, kerogen transforms into oil.
kettle hole	A circular depression in the ground made when a block of ice calves off the toe of a glacier, becomes buried by till, and later melts.
knob-and-kettle topography	A land surface with many kettle holes separated by round hills of glacial till.
K-T boundary event	The mass extinction that happened at the end of the Cretaceous Period, 65 million years ago, possibly because of the collision of an asteroid with the Earth.