The process of ice sheets and glaciers melting and receding, typically at the end of an ice age.
From de- (prefix meaning reversal or removal) plus glaciation (from glacial, from Latin glacies, 'ice'), with -tion suffix.
The last deglaciation, which ended about 11,700 years ago, raised sea levels by over 400 feet and fundamentally reshaped human civilization as coastlines transformed.
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