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Mason-Dixon Line

(Encyclopedia)Mason-Dixon Line, boundary between Pennsylvania and Maryland (running between lat. 39°43′26.3″N and lat. 39°43′17.6″N), surveyed by the English team of Charles Mason, a mathematician and ast...

fall line

(Encyclopedia)fall line, boundary between an upland region and a coastal plain across which rivers from the upland region drop to the plain as falls or rapids. A fall line is formed in an area where the rivers have...

snow line

(Encyclopedia)snow line, altitude above which or latitude beyond which snow does not melt in summer (usually called the permanent snow line), or, in winter, the line to which snow extends at a given point in time. ...

Wallace's line

(Encyclopedia)Wallace's line, imaginary line postulated by A. R. Wallace as the dividing line between Asian and Australian fauna in the Malay Archipelago. It passes between Bali and Lombok islands and between Borne...

Maginot Line

(Encyclopedia)Maginot Line măzhˈĭnō, Fr. mäzhēnōˈ [key], system of fortifications along the eastern frontier of France, extending from the Swiss border to the Belgian. It was named for André Maginot, who w...

assembly line

(Encyclopedia)assembly line, manufacturing technique in which a product is carried by some form of mechanized conveyor among stations at which the various operations necessary to its assembly are performed. It is u...

line spectrum

(Encyclopedia)line spectrum: see spectrum.

base line

(Encyclopedia)base line: see geodesy.

date line, international

(Encyclopedia)date line, international: see international date line. ...

international date line

(Encyclopedia)international date line, imaginary line on the earth's surface, generally following the 180° meridian of longitude, where, by international agreement, travelers change dates. Traveling eastward acros...