What are kettles, and how do they form?

Name: What are kettles, and how do they form?
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The Answer is Kettles are circular to oval depressions, sometimes containing small lakes, found on outwash plains, valley trains, or end moraines. They form when a block of ice, left by a retreating glacier, is partly or wholly buried, which subsequently melts, leaving a depression.

What Are Kettles, and How Do They Form