The New Encyclopędia BritannicaEncyclopędia Britannica, 1983 - Encyclopedias and dictionaries |
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Page 62
... Earth or if Earth were to be exposed to agents from other planets capable of contaminating life on this one . If planets capable of supporting life are reached someday , they will offer an opportunity to science never before available ...
... Earth or if Earth were to be exposed to agents from other planets capable of contaminating life on this one . If planets capable of supporting life are reached someday , they will offer an opportunity to science never before available ...
Page 120
... Earth's mantle . The basaltic layer is 15 to 40 kilometres ( 9 to 25 miles ) thick , with a mean thickness of 20 kilometres ( 12 miles ) . In many instances , the crust exhibits many more subdivisions , which differ in their elastic ...
... Earth's mantle . The basaltic layer is 15 to 40 kilometres ( 9 to 25 miles ) thick , with a mean thickness of 20 kilometres ( 12 miles ) . In many instances , the crust exhibits many more subdivisions , which differ in their elastic ...
Page 146
... Earth that the Ptolemaic system required to account for the observed motions of heavenly bodies , a simpler , alternative explanation might be possible . In consequence , he read the works of many original Greek authors and found that ...
... Earth that the Ptolemaic system required to account for the observed motions of heavenly bodies , a simpler , alternative explanation might be possible . In consequence , he read the works of many original Greek authors and found that ...
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activity American animals appear areas authority become body called cause cells central century charge common complex conservation consists constant constitution consumer contain continental continued copper cosmic rays countries court crime criminal Crusade direct early effect electron elements energy England established Europe evidence example exist fact field force ground groups House important increase individual industrial involved Italy known land later less letters limited living major material means measure ment metal natural occur organic original particles particular party percent period person play political population position present problems protection reefs region remains result rule social South species structure theory tion United usually various