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Pi (3.14159)

Pi (3.14159) is the ratio of the circumference of a circle to its diameter, approximately 22 divided by 7, or about 3.14159.

Permafrost

Permafrost is permanently frozen ground, including soil, sediment, or rock. To be considered permafrost, the field must remain below freezing for at least two consecutive years and can last for tens of thousands of the year.