drop trough
61Victoria Falls — 1. falls of the Zambezi River in S Africa, between Zambia and Zimbabwe, near Livingstone. 420 ft. (130 m) high; more than 1 mi. (1.6 km) wide. 2. former name of Iguassú Falls. * * * Waterfall, at the border between Zambia and Zimbabwe.… …
62Cambrian Period — Oldest time division of the Paleozoic Era. During the Cambrian, 543–490 million years ago, there were widespread seas and several scattered landmasses. The largest continent was Gondwana. The average climate was probably warmer than today, with… …
63stage design — Aesthetic composition of a dramatic production as created by lighting, scenery, costumes, and sound. While elements such as painted screens and wheeled platforms were used in the Greek theatre of the 4th century BC, most innovations in stage… …
64Future of newspapers — Newspapers: a global industry in transition The future of newspapers has been widely debated as the industry has faced down soaring newsprint prices, slumping ad sales, the loss of much classified advertising and precipitous drops in circulation …
65Health care reform debate in the United States — See also: Health care reform in the United States, Health care in the United States, and Uninsured in the United States Health care in the United States Public health care Federal Employees Health Benefits Program Indian Health Service… …
66Olympic Sliding Centre Innsbruck — Four man wok racing at the 2006 World Championships held at the track. Germany s Georg Hackl is among the four man team on the track …
67Propeller — A propeller is essentially a type of fan which transmits power by converting rotational motion into thrust for propulsion of a vehicle such as an aircraft, ship, or submarine through a mass such as water or air, by rotating two or more twisted… …
68Waterfall — For other uses, see Waterfall (disambiguation). Angel Falls in Venezuela is the world s tallest waterfall at 979;m (3,212 ft) …
69Cold front — For the Star Trek: Enterprise episode, see Cold Front (Star Trek: Enterprise). For the G.I. Joe character, see Cold Front (G.I. Joe). The symbol of a cold front: a blue line with triangles pointing in the direction of travel A cold front is… …
70Mercury battery — A mercury battery (also called mercuric oxide battery, or mercury cell) is a non rechargeable electrochemical battery, a primary cell. Due to the content of mercury, and the resulting environmental concerns, the sale of mercury batteries is… …
