geological instability
71Environmental effects of coal — There are a number of adverse environmental effects of coal mining and burning.These effects include: * release of carbon dioxide and methane, both of which are greenhouse gases causing climate change and global warming according to the IPCC.… …
72Balch Creek — Geobox | River name = Balch Creek category = Creek image size = image caption = Waterfall in Macleay Park etymology = Danford Balch, early settler country = United States country state = Oregon district type = County district = Multnomah source …
73Arktische Klimaveränderung — Die zur Arktis zählenden Gebiete sind auf dieser Weltkarte grün eingefärbt. Eine Satellitenaufnahme mit der Arktis im Zentrum, dank technisc …
74Arktische Klimaveränderungen — Die zur Arktis zählenden Gebiete sind auf dieser Weltkarte grün eingefärbt. Eine Satellitenaufnahme mit der Arktis im Zentrum, dank technisc …
75Antarctica — /ant ahrk ti keuh, ahr ti /, n. the continent surrounding the South Pole: almost entirely covered by an ice sheet. ab. 5,000,000 sq. mi. (12,950,000 sq. km). Also called Antarctic Continent. * * * Antarctica Introduction Antarctica Background:… …
76North America — North American. the northern continent of the Western Hemisphere, extending from Central America to the Arctic Ocean. Highest point, Mt. McKinley, 20,300 ft. (6187 m); lowest, Death Valley, 276 ft. (84 m) below sea level. 400,000,000 including… …
77Tragic Optimism for a Millennial Dawning — ▪ 1999 Introduction by Stephen Jay Gould Stephen Jay Gould, Professor of Geology and Curator of Invertebrate Paleontology at Harvard University since 1973, has gained worldwide renown as a paleontologist, evolutionary biologist, and, not least,… …
78Gold standard — For other uses, see Gold standard (disambiguation). Under a gold standard, paper notes are convertible into pre set, fixed quantities of gold. The gold standard is a monetary system in which the standard economic unit of account is a fixed mass… …
79Avalanche — This article refers to the natural event. For other uses, see Avalanche (disambiguation) An avalanche is an abrupt and rapid flow of snow, often mixed with air and water, down a mountainside. Avalanches are among the biggest dangers in the… …
80Moons of Uranus — Uranus and its six largest moons compared at their proper relative sizes and relative positions. From left to right: Puck, Miranda, Ariel, Umbriel, Titania and Oberon Uranus, the seventh planet of the Solar System, has 27 known moons …
