A kettle lake forms when a block of ice breaks off the glacier and gets stuck in the dirt leaving a depression which fills up with water as the ice melts.
A kettle is a depression/hole in an out-wash plain formed by retreating glaciers or draining floodwaters. The kettles are formed as a result of blocks of dead ice left behind by retreating glaciers, which become surrounded by sediment deposited by melt-water streams as there is increased friction.
Kettle lakes can be feet or miles long, but they are usually shallow. Kettle lakes form in front of the Kennicott Glacier.
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