Thaw depth Thaw depth In soil science, the thaw depth or thaw line is the instantaneous level down to which the soil has warmed to zero degrees celcius. The active layer thickness is the maximum thaw depth over a period of two years. The layer of soil over the thaw depth is called the active layer, while the soil below is called permafrost. The term frost front refers to the varying position of the thaw line during the periods of freezing/thawing. The knowledge of the thaw depth is important for the two major reasons: its influence on the ecology and on construction
Zero-marking in English and indefinite has to be made. The zero article is used with meals. The zero article is used when describing calendar years. The zero article is used before titles There is variation among dialects concerning which words may be used without the definite article. Standard American English, for example, requires "the" before "hospital". In some dialects in the North of England, especially in Lancashire and Yorkshire, the pronunciation of the word "the" is commonly abbreviated. In these regions, the definite article may also be reduced to , , or a glottal stop (often spelled "t′" or "th′"). Indian English frequently