The New Encyclopędia BritannicaEncyclopędia Britannica, 1983 - Encyclopedias and dictionaries |
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Page 49
... believed to be pre- dominantly of basaltic composition . The seismic P - wave velocities in the crust mostly vary from six to seven kilo- metres ( about four miles ) per second . Below the crust lies the mantle , which extends downward ...
... believed to be pre- dominantly of basaltic composition . The seismic P - wave velocities in the crust mostly vary from six to seven kilo- metres ( about four miles ) per second . Below the crust lies the mantle , which extends downward ...
Page 53
... believed to be about 70 kilometres ( 40 miles ) thick ; beneath highly evolved continental regions such as Precambrian shields the thickness would be closer to 150 kilometres ( 90 miles ) . Low - velocity zone . In many oceanic regions ...
... believed to be about 70 kilometres ( 40 miles ) thick ; beneath highly evolved continental regions such as Precambrian shields the thickness would be closer to 150 kilometres ( 90 miles ) . Low - velocity zone . In many oceanic regions ...
Page 929
... believed to be the case is evident for the person believing it ; ( 3 ) what is believed to be the case is true . The question then arises , however , whether the rejection versus of the possibility of completely certain knowledge is jus ...
... believed to be the case is evident for the person believing it ; ( 3 ) what is believed to be the case is true . The question then arises , however , whether the rejection versus of the possibility of completely certain knowledge is jus ...
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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