The New Encyclopædia BritannicaEncyclopædia Britannica, 1983 - Encyclopedias and dictionaries |
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Page 10
Mantle , crust , and Mohoro- vičić Dis- continuity Role of geosyn- clines in earth his- tory Differen- tiation of core , mantle , and crust The. satisfactory age has been determined . The method is largely restricted to igneous and ...
Mantle , crust , and Mohoro- vičić Dis- continuity Role of geosyn- clines in earth his- tory Differen- tiation of core , mantle , and crust The. satisfactory age has been determined . The method is largely restricted to igneous and ...
Page 51
... crust : ( 1 ) in highly evolved regions , such as shields , the lower crust is probably highly heterogeneous and comprised on the average of groups of rocks of intermediate chemical composition ( in granulitic or eclogitic metamorphic ...
... crust : ( 1 ) in highly evolved regions , such as shields , the lower crust is probably highly heterogeneous and comprised on the average of groups of rocks of intermediate chemical composition ( in granulitic or eclogitic metamorphic ...
Page 57
... crust immediately above . The result is the formation of a re- sidual ultramafic zone in the mantle , a process that has reached its maximum development in Precambrian shield regions . In lateral differentiation oceanic crust is formed ...
... crust immediately above . The result is the formation of a re- sidual ultramafic zone in the mantle , a process that has reached its maximum development in Precambrian shield regions . In lateral differentiation oceanic crust is formed ...
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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