Figure 9. Stages in the formation of a glacial kettle.

a. A block of melting ice partly buried by river sand and gravel.

b. The block is completely buried but glacially-derived sand and gravel continue to spread over the site.

c. After deposition has ceased the buried ice block has melted, permitting the overlying layers to collapse into the opening.

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Last updated on September 6, 2006.

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