The New Encyclopædia BritannicaEncyclopædia Britannica, 1983 - Encyclopedias and dictionaries |
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Page 12
... Precambrian time the continents were well formed . Precambrian rocks also are exposed in the eastern United States in the Piedmont Province and Blue Ridge and in the central and western United States in uplifts at the Ozark Plateau ...
... Precambrian time the continents were well formed . Precambrian rocks also are exposed in the eastern United States in the Piedmont Province and Blue Ridge and in the central and western United States in uplifts at the Ozark Plateau ...
Page 13
... Precambrian rocks . Among them are the world's largest iron deposits ( Canadian , Baltic , Amazonian , and Guianan shields , and in the Ukraine , U.S.S.R. ) ; the world's largest gold deposits on the African Shield and other important ...
... Precambrian rocks . Among them are the world's largest iron deposits ( Canadian , Baltic , Amazonian , and Guianan shields , and in the Ukraine , U.S.S.R. ) ; the world's largest gold deposits on the African Shield and other important ...
Page 1038
... Precambrian eras . Stretching over an estimated 3,500 , - 000,000 years , the Precambrian eras provided basement rocks for the greater part of the continent : they can be subdivided into an older Archeozoic ( or Archean ) and a younger ...
... Precambrian eras . Stretching over an estimated 3,500 , - 000,000 years , the Precambrian eras provided basement rocks for the greater part of the continent : they can be subdivided into an older Archeozoic ( or Archean ) and a younger ...
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activity Africa agriculture America became become body called capital caused central centre century changes Christian Church continued core countries cultural demand direction early Earth East Eastern eclipse economic effect established Europe example feet field Figure flow force groups growth important income increase industry internal investment Italy kilometres known labour Lake land later less living magnetic major mantle material means measurements ment metres miles mountains move movement nature North observed occur ocean organization origin Orthodox patriarch percent period planning Pleistocene political population position possible present problems production region relatively remained result rise River rocks social society South species structure surface theory tion trade traditional United West Western