PINGO
- a low mound of earth formed by expansion of underlying frost [n PINGOES, PINGOS]
- hill of soil-covered ice pushed up by hydrostatic pressure in an area of permafrost
- hill of similar origin remaining after the melting of permafrost
- a low hill or mound forced up by hydrostatic pressure in an area underlain by permafrost
- a cone-shaped mound [n -S or -ES]
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