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dating

(Encyclopedia)dating, the determination of the age of an object, of a natural phenomenon, or of a series of events. There are two basic types of dating methods, relative and absolute. In relative dating, the tempor...

Gogebic

(Encyclopedia)Gogebic gōgēˈbĭk [key], east-west mountain range, 80 mi (129 km) long and .5 to 1 mi (.8–1.6 km) wide, extending from the W Upper Peninsula, N Mich., into N Wis. It is known for its iron deposit...

Great Zimbabwe

(Encyclopedia)Great Zimbabwe zĭmbäbˈwā [key] [Bantu,=stone houses], ruined city, SE Zimbabwe, near Masvingo (formerly Fort Victoria). Its mortarless, curving granite walls and buildings were constructed in 11th...

Kryvyy Rih

(Encyclopedia)Kryvyy Rih krĭvĭˈ rĭkh [key], Rus. Krivoy Rog, city (1989 pop. 713,000), SE Ukraine, at the confluence of the Inhulets and Saksagan rivers. It is a rail junction, an industrial center, and a metal...

ferrous sulfate

(Encyclopedia)ferrous sulfate or iron (II) sulfate, chemical compound, FeSO4. It is known as the monohydrate, FeSO4·H2O; the tetrahydrate, FeSO4·4H2O; the pentahydrate, FeSO4·5H2O; and the heptahydrate, FeSO4·7...

Fe

(Encyclopedia)Fe, symbol for the element iron.

Jamshedpur

(Encyclopedia)Jamshedpur jŭmˌshĕdpo͝orˈ [key], city (1991 pop. 461,212), Jharkand state, E central India, at the confluence of the Subarnarekha and Kharkai rivers. A great iron- and steel-producing center, it ...

Bogardus, James

(Encyclopedia)Bogardus, James bōgärˈdəs [key], 1800–1874, American architect, b. Catskill, N.Y. Among the first to use cast iron in the construction of building facades, Bogardus was noted for his commercial ...

ocher

(Encyclopedia)ocher ōˈkər [key], mixture of varying proportions of iron oxide and clay, used as a pigment. It occurs naturally as yellow ocher (yellow or yellow-brown in color), the iron oxide being limonite, or...

Hama

(Encyclopedia)Hama or Hamah both: häˈmä [key], city (1995 est. pop. 280,000), capital of Hama governorate, W central Syria, on the Orontes River. It is the market center for an irrigated farm region where cotton...