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Tati

(Encyclopedia)Tati täˈtē [key], region, c.2,070 sq mi (5,360 sq km), NE Botswana. Nickel, copper, and manganese are mined in the region. Tati was a source of gold for centuries; mining ceased there in the early ...

Val d'Or

(Encyclopedia)Val d'Or väl dôr [key], town (1991 pop. 23,842), SW Que., Canada, SE of Rouyn-Noranda. It is a mining center. Gold was discovered in the region in 1909; copper, zinc, lead, and molybdenum are also m...

Timmins

(Encyclopedia)Timmins, town (1991 pop. 47,461), central Ont., Canada, on the Mattagami River. Timmins is the commercial center of the rich Porcupine gold-mining district, where gold was first discovered in 1909. Si...

Ordu

(Encyclopedia)Ordu ôrdo͞oˈ [key], city (1990 pop. 101,306), capital of Ordu prov., N Turkey, a port on the Black Sea. Copper, zinc, and iron are exported. It is the site of Cotyora, founded by Greek colonists, c...

Anaximenes

(Encyclopedia)Anaximenes ănˌəksĭmˈĭnēz [key], Greek philosopher, 6th cent. b.c., last of the Milesian school founded by Thales. With Thales he held that a single element lay behind the diversity of nature, a...

catalyst

(Encyclopedia)catalyst, substance that can cause a change in the rate of a chemical reaction without itself being consumed in the reaction; the changing of the reaction rate by use of a catalyst is called catalysis...

Avesta, city, Sweden

(Encyclopedia)Avesta äˈvəstäˌ [key], city (1990 est. pop. 16,860), Kopparberg co., S central Sweden, on the Dalälven River. Aluminum and high quality steel are manufactured there. Formerly a copper mining and...

Kolwezi

(Encyclopedia)Kolwezi kōlwĕzˈē [key], city (1984 pop. 416,122), Haut-Katanga prov., SE Congo (Kinshasa). It is a center for copper and cobalt mining. There are copper-ore concentration plants, a zinc refinery, ...

Paris green

(Encyclopedia)Paris green, also called Schweinfurt green, an extremely poisonous, bright green powder that was formerly used extensively as a pigment (e.g., in wallpaper) and that is sometimes used as an insecticid...

Alice Springs

(Encyclopedia)Alice Springs, town, Northern Territory, Australia. It lies in a pastoral area surrounded by desert near the center of the continent and is a stop on the Adelaide Darwin Railway. The town ...