The New Encyclopaedia Britannica, Volume 6

activity African 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 existence feet field Figure flow force groups growth important income increase industry influence internal investment Italy kilometres known labour Lake land later less living magnetic major mantle material means measurements ment 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 rocks social society South species structure surface theory tion trade traditional United West Western