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Two men dig in Alaska to study soil. A jackhammer is used to break the hard permafrost

In geology, permafrost is soil that stays at or below 0 °C (32 °F) for two or more years. It is also called cryotic soil. Most permafrost is on land close to the North and South poles. Other permafrost is found in in high mountain areas. [1] When permafrost melts, carbon dioxide is released which can be bad for the environment.