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The horizon (or skyline) is the apparent line that separates earth from sky, the line that divides all visible directions into two categories: those that intersect the Earth's surface, and those t ...
Wikipedia Article
A protractor is a square, circular or semicircular tool, typically made of transparent plastic, for measuring angles. Most protractors measure angles in degrees (°). Radian-scale protractors measure a ...
Definition
For other uses, see Chimney (disambiguation). "Smokestack" redirects here. For the 1963 avant-garde jazz album, see Smokestack (album). A chimney is a structure which provides ventilation fo ...
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