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Willis Tower

(Encyclopedia)Willis Tower, formerly the Sears Tower, Chicago, the second tallest building in the United States. Until the completion of the 1,483-ft (452-m) Petronas Towers (1998) in Kuala Lumpur, Malaysia, it was...

Salisbury, cities, United States

(Encyclopedia)Salisbury. 1 City (1990 pop. 20,592), seat of Wicomico co., Md., on the Eastern Shore, at the head of the Wicomico River; settled 1732, inc. 1872. Poultry raising and processing is the major industry....

cobalt, chemical element

(Encyclopedia)cobalt, metallic chemical element; symbol Co; at. no. 27; at. wt. 58.9332; m.p. 1,495℃; b.p. about 2,870℃; sp. gr. 8.9 at 20℃; valence +2 or +3. Cobalt is a silver-white, lustrous, hard, brittle...

abrasive

(Encyclopedia)abrasive, material used to grind, smooth, cut, or polish another substance. Natural abrasives include sand, pumice, corundum, and ground quartz. Carborundum (silicon carbide) and alumina (aluminum oxi...

grinding

(Encyclopedia)grinding, process by which surface material is removed from an object, usually metal, by the abrasive action of a rotating wheel or a moving belt that contains abrasive grains. A grinding wheel can be...

emerald

(Encyclopedia)emerald, the green variety of beryl, of which aquamarine is the blue variety. Chemically, it is a beryllium-aluminum silicate whose color is due to small quantities of chromium compounds. The emerald ...

Longview

(Encyclopedia)Longview. 1 City (1990 pop. 70,311), seat of Gregg co., E Tex.; inc. 1872. It is a manufacturing, business, and distribution center for the rich East Texas oil field. The city has oil and natural-gas ...

Kaohsiung

(Encyclopedia)Kaohsiung or Kao-hsiung both: gouˈshyo͞ongˈ [key], special municipality (2010 pop. 2,777,384), 1,140 sq mi (2,952 sq km), S Taiwan. The economic center of S Taiwan, it is Taiwan's leading port but ...

bronze, in metallurgy

(Encyclopedia)bronze, in metallurgy, alloy of copper, tin, zinc, phosphorus, and sometimes small amounts of other elements. Bronzes are harder than brasses. Most are produced by melting the copper and adding the de...

talc

(Encyclopedia)talc, mineral ranging in color from white through various shades of gray and green to the red and brown of impure specimens, translucent to opaque, and having a greasy, soapy feel. It is a hydrous sil...