Permafrost is frozen ground that remains at or below zero degrees Celsius (32 degrees Fahrenheit) for two or more years. It forms in regions where the mean annual temperature is colder than zero degrees Celsius. Permafrost is found beneath about 20 percent of the land in the Northern Hemisphere. It is widespread in the Arctic and in parts of Antarctica. Most of the world’s permafrostPermafrost is frozen ground that remains at or below zero degrees Celsius (32 degrees Fahrenheit) for two or more years. It forms in regions where the mean annual temperature is... More has been frozen for 1000s of years and can be up to 1,500 metres (almost 5,000 feet) thick. The layer of ground above permafrost that is subject to annual thawing and freezing is called the active layerThe layer of ground above permafrost that is subject to annual thawing and freezing.... More.

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