The New Encyclopædia BritannicaEncyclopædia Britannica, 1983 - Encyclopedias and dictionaries |
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Page 52
The three regions of the mantle Conflicting geo- physical evidence on density Alpine- type peridotites Mineral as- semblages and structure 200 300 400 depth (. into three regions . The upper mantle extends to a depth of 400 kilometres ...
The three regions of the mantle Conflicting geo- physical evidence on density Alpine- type peridotites Mineral as- semblages and structure 200 300 400 depth (. into three regions . The upper mantle extends to a depth of 400 kilometres ...
Page 57
... mantle Moho residual peridotite midocean ridge basalt magma magma segregation partial melting in rising column -partial melting pyrolite source region pyrolite mantle t primary pyrolite ↑ -1.50 250- basalt or amphilbolite Δ basalt ...
... mantle Moho residual peridotite midocean ridge basalt magma magma segregation partial melting in rising column -partial melting pyrolite source region pyrolite mantle t primary pyrolite ↑ -1.50 250- basalt or amphilbolite Δ basalt ...
Page 703
... mantle , and the Wiechert - Gutenberg Discontinuity , which separates the mantle from the core . The latter discontinuity exists at a depth of 2,900 kilometres ( 1,800 miles ) ; it is marked by a sudden increase in density , from about ...
... mantle , and the Wiechert - Gutenberg Discontinuity , which separates the mantle from the core . The latter discontinuity exists at a depth of 2,900 kilometres ( 1,800 miles ) ; it is marked by a sudden increase in density , from about ...
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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