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 language when it occurs, tends to show a strong relationship with word order. Languages in which zero-marking is widespread are almost all subject–verb–object, perhaps because verb-medial order allows two or more nouns to be recognised as such much more easily than subject–object–verb, object–subject–verb, verb–subject–object, or verb-object-subject order, for which two nouns might be adjacent and their role in a sentence possibly thus confused. It has been suggested that verb-final languages may be likely to develop verb-medial order if marking on nouns is lost. Zero-marking language A zero-marking language is one with no grammatical marks on the dependents or the modifiers or