copper-lead bearing
91gold processing — Introduction preparation of the ore for use in various products. For thousands of years the word gold has connoted something of beauty or value. These images are derived from two properties of gold, its colour and its chemical stability.… …
92pre-Columbian civilizations — Introduction the aboriginal American Indian (Mesoamerican Indian) cultures that evolved in Meso America (part of Mexico and Central America) and the Andean region (western South America) prior to Spanish exploration and conquest in the 16th …
93Terminal ballistics — Terminal ballistics, a sub field of ballistics, is the study of the behavior of a projectile when it hits its target. It is often referred to as stopping power when dealing with human or other living targets. Terminal ballistics is as relevant… …
94Asia — /ay zheuh, ay sheuh/, n. a continent bounded by Europe and the Arctic, Pacific, and Indian oceans. 2,896,700,000; ab. 16,000,000 sq. mi. (41,440,000 sq. km). * * * I Largest continent on Earth. It is bounded by the Arctic Ocean, the Pacific Ocean …
95.22 Long Rifle — 22 redirects here. For other uses, see .22 (disambiguation). .22 Long rifle .22 Long Rifle – Subsonic Hollow point (left). Standard Velocity (center), Hyper Velocity Stinger Hollow point (right). T …
96Silver mining in the United States — began on a major scale with the discovery of the Comstock Lode in Nevada in 1858. The industry suffered greatly from the demonetization of silver in 1873 by the Crime of 73, but silver mining continues today.The United States produced 1,200… …
97silver — silverer, n. silverish, adj. silverless, adj. silverlike, adj. silverness, n. /sil veuhr/, n. 1. Chem. a white, ductile metallic element, used for making mirrors, coins, ornaments, table utensils, photographic chemicals, conductors, etc. Symbol:… …
98Silver — /sil veuhr/, n. Abba Hillel /ab euh/, 1893 1963, U.S. rabbi, born in Lithuania. * * * I Metallic chemical element, one of the transition elements, chemical symbol Ag, atomic number 47. It is a white, lustrous precious metal, valued for its beauty …
99Soldering — For the song, see Soldering (song). For the product, see Solder. Desoldering a contact from a wire. Soldering is a process in which two or more metal items are joined together by melting and flowing a filler metal (solder) into the joint, the… …
100Europe, history of — Introduction history of European peoples and cultures from prehistoric times to the present. Europe is a more ambiguous term than most geographic expressions. Its etymology is doubtful, as is the physical extent of the area it designates.… …
