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
Centigrade 232 spell with Hawkwind from 1976 that he had become more recognised as being a singer and front-man of a rock band, but he continued actively writing poems and plays during this time. In 1977 a collection of his poems were compiled and published by Quasar books, the title being (allegedly) the temperature at which writing paper burns "signifying the writer destroying his rough drafts". This is an allusion to the Ray Bradbury novel "Fahrenheit 451" and possibly the film thereof, 451°F being equivalent to 232 Centigrade. Some of the poems are pieces he had performed with Hawkwind during the "Space