Its namesake sporadic zone is labeled SPZ, while its discontinous zone is labeled DPZ.
Mixing of materials in regions containing this substance can lead to histels, turbels, or orthels and is known as cryoturbation. One type of this substance is called yedoma, which can contain a layer of ground called a talik. Their namesake plateau occurs when groups of palsas form an elevated flatland area usually located in a peat bog. Changes in this substance can create land surfaces featuring many hummocks (*) and thermokarst lakes or lead to forests of drunken trees. Its namesake sporadic zone is labeled SPZ, while its discontinous zone is labeled DPZ. Rising temperatures may release large amounts of methane from this substance. For 10 points, name this type of soil that remains below the freezing point for two or more years.
Mixing of materials in regions containing this substance can lead to histels, turbels, or orthels and is known as cryoturbation.
permafrost [prompt on "gelisols" in the first sentence]