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In astronomy or planetary science, the frost line, also known as the snow line or ice line, is the minimum distance from the central protostar of a solar nebula where the temperature is low enough for volatile compounds such as water, ammonia, methane, carbon dioxide and carbon monoxide to condense into solid grains, which will allow their accretion into planetesimals.
Map showing the snowbelts around the Great Lakes of North America with 150 cm (60 in) accumulations or more during winter. The Snowbelt, Snow Belt, Frostbelt, or Frost Belt [1] is the region near the Great Lakes in North America where heavy snowfall in the form of lake-effect snow is particularly common. [2]
The frost line—also known as frost depth or freezing depth—is most commonly the depth to which the groundwater in soil is expected to freeze. The frost depth depends on the climatic conditions of an area, the heat transfer properties of the soil and adjacent materials, and on nearby heat sources.
Territorial evolution of the United States; The Mason–Dixon line – another line linked to the slave-free division in the U.S. Royal Colonial Boundary of 1665 – the border between the Colony of Virginia and the Province of Carolina that follows the parallel 36°30′ north latitude that came to be associated with the Missouri Compromise of ...
Sun Belt, southern, hot-weather states stretching from coast to coast; Unchurched Belt, a region in the far Northwestern United States that has low religious attendance; Wheat Belt, northern midwestern states where most of North America's grain and soybeans are grown (cf. Breadbasket) [1]
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Because the frost line accumulated large amounts of water via evaporation from infalling icy material, it created a region of lower pressure that increased the speed of orbiting dust particles and halted their motion toward the Sun. In effect, the frost line acted as a barrier that caused the material to accumulate rapidly at ~5 AU from the Sun.
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