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Permian period

(Encyclopedia)Permian period pûrˈmēən [key] [from Perm, Russia], sixth and last period of the Paleozoic era (see Geologic Timescale, tablegeologic timescale, table) from 250 to 290 million years ago. Many ma...

Artemovsk

(Encyclopedia)Artemovsk ərtyôˈməfsk [key], Ukr. Artemivsk, city (1989 pop. 90,000), in Ukraine. An industrial center of the Donets Basin, it produces metals, mining equipment, glass, bricks, and chemicals. Near...

Maisons-Alfort

(Encyclopedia)Maisons-Alfort māzôNz-älfôrˈ [key], suburb SE of Paris (1990 pop. 54,065), Val-de-Marne dept., N central France. There is some agriculture, but it is mainly an industrial town producing chemicals...

Villeurbanne

(Encyclopedia)Villeurbanne vēlürbänˈ [key], city (1990 pop. 119,848), Rhône dept., E central France, a suburb E of Lyons. It is a major industrial center; metals, machines, textiles, and chemicals are produced...

transition elements

(Encyclopedia)transition elements or transition metals, in chemistry, group of elements characterized by the filling of an inner d electron orbital as atomic number increases. This includes the elements from titani...

alkaline earths

(Encyclopedia)alkaline earths ălˈkəlīn, –lĭn [key], oxides of the alkaline-earth metals, especially of calcium, strontium, and barium. They are not readily soluble in water and form solutions less basic than...

oxyacetylene torch

(Encyclopedia)oxyacetylene torch ŏkˌsēəsĕtˈəlēn [key], tool that mixes and burns oxygen and acetylene to produce an extremely hot flame. This torch can be used for cutting steel and for welding iron and var...

treasure-trove

(Encyclopedia)treasure-trove, in English law, buried or concealed money or precious metals without any ascertainable owner. Such property belongs to the crown. The present practice in Great Britain is for the crown...

Zawiercie

(Encyclopedia)Zawiercie zävyĕrˈchĕ [key], city (1992 est. pop. 56,000), Śląskie prov., S Poland, on the Warta River. Its industries produce metals, glass, machinery, chemicals, and apparel. Lignite and iron o...

Siemianowice Śląskie

(Encyclopedia)Siemianowice Śląskie shĕmyänôvēˈtsĕ shläNˈskyĕ [key], city (1991 est. pop. 80,600), Śląskie prov., S Poland. A center of the Katowice mining and industrial region, it has ironworks and st...