spring, ebb-and-flow — ; ebbing and flowing well A spring (flowing well or borehole) exhibiting periodic variation in volume of flow; this variation, which may be regular or irregular, is often attributed in karst regions to siphonic action. Ebb and flow springs… … Lexicon of Cave and Karst Terminology
spring, intermittent — 1. A karst spring with a pulsating flow, caused by the presence within the rock of cavities and siphons fed by a subterranean watercourse. When the cavity is full, the siphon is complete and causes a pulse of water to issue from the spring.… … Lexicon of Cave and Karst Terminology
periodic spring — See spring, periodic … Lexicon of Cave and Karst Terminology
List of non-periodic comets — Non periodic comets (or long period comets) are comets that do not have confirmed observations at more than one perihelion passage,[1] and thus generally have orbital periods of 200 years or more. They include single apparition comets that pass… … Wikipedia
The Speaker's House — is a historical museum located in Trappe, PA that preserves the home of Frederick August Muhlenberg, the First and Third Speaker of the United States House of Representatives.History of the Muhlenberg HouseOverview of the Muhlenberg House: From… … Wikipedia
china — /chuy neuh/, n. 1. a translucent ceramic material, biscuit fired at a high temperature, its glaze fired at a low temperature. 2. any porcelain ware. 3. plates, cups, saucers, etc., collectively. 4. figurines made of porcelain or ceramic material … Universalium
China — /chuy neuh/, n. 1. People s Republic of, a country in E Asia. 1,221,591,778; 3,691,502 sq. mi. (9,560,990 sq. km). Cap.: Beijing. 2. Republic of. Also called Nationalist China. a republic consisting mainly of the island of Taiwan off the SE coast … Universalium
Mathematics and Physical Sciences — ▪ 2003 Introduction Mathematics Mathematics in 2002 was marked by two discoveries in number theory. The first may have practical implications; the second satisfied a 150 year old curiosity. Computer scientist Manindra Agrawal of the… … Universalium
United States — a republic in the N Western Hemisphere comprising 48 conterminous states, the District of Columbia, and Alaska in North America, and Hawaii in the N Pacific. 267,954,767; conterminous United States, 3,022,387 sq. mi. (7,827,982 sq. km); with… … Universalium
Clock — For other uses, see Clock (disambiguation). Timepiece redirects here. For the Kenny Rogers album, see Timepiece (album). Platform clock at King s Cross railway station, London … Wikipedia
