Bureau of Labor Statistics. Overview: The Bureau of Labor Statistics (BLS) is one of eight specialized divisions within the Department of Labor, and a direct descendent of the original Bureau of Labor, Department of the Interior, established in 1884. (Todayâs Department of Labor was established as a cabinet-level agency in 1913).
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Freezing level. The freezing level, or 0 Â°C (zero-degree) isotherm, represents the altitude in which the temperature is at 0 Â°C (the freezing point of water) in a free atmosphere (i.e. allowing reflection of the sun by snow, etc.). Any given measure is valid for only a short period of time, often less than a day.