principal+elements
51agricultural technology — Introduction application of techniques to control the growth and harvesting of animal and vegetable products. Soil preparation Mechanical processing of soil so that it is in the proper physical condition for planting is usually… …
52printing — /prin ting/, n. 1. the art, process, or business of producing books, newspapers, etc., by impression from movable types, plates, etc. 2. the act of a person or thing that prints. 3. words, symbols, etc., in printed form. 4. printed material. 5.… …
53mass spectrometry — or mass spectroscopy Analytic technique by which chemical substances are identified by sorting gaseous ions by mass using electric and magnetic fields. A mass spectrometer uses electrical means to detect the sorted ions, while a mass spectrograph …
54Gnosticism — This article is part of a series on Gnosticism History of Gnosticism …
55Africa — • This name, which is of Phoenician origin, was at first given by the Romans to the territory about the city of Carthage Catholic Encyclopedia. Kevin Knight. 2006. Africa Africa …
56theatre music — ▪ musical genre Introduction any music designed to form part of a dramatic performance, as, for example, a ballet, stage play, motion picture, or television program. Included are the European operetta and its American form, the musical… …
57Scientific method — …
58aerospace industry — Introduction assemblage of manufacturing concerns that deal with vehicular flight within and beyond the Earth s atmosphere. (The term aerospace is derived from the words aeronautics and spaceflight.) The aerospace industry is engaged in the …
59Catechism — A catechism (pronEng|ˈkætəkɪzəm; gr. κατηχισμός) is a summary or exposition of doctrine, traditionally used in Christian religious teaching from New Testament times to the present. [ [http://bible.crosswalk.com/Lexicons/Greek/grk.cgi?number=2727… …
60Éclairage (vélo) — Pour les articles homonymes, voir éclairage. Un éclairage à pile sur un vélo de course L éclairage à vélo est l ensemble des composants permettant à un cycliste de voir et d être vu d …
