The New Encyclopaedia Britannica: Macropaedia : Knowledge in depth

activity agriculture Anatolia ancient animals Arctic Aristotle Asia Asian Atlantic atmosphere atoms Bangladesh basin become called Central century China Chinese climate coast common complex contains continued countries covered criticism cultural deposits early east eastern economic effect electrons energy example exploration extended feet field flow force forest groups Gulf important increased India industrial Island known Lake land language later less live lower major material miles million mountains natural northern occur Ocean organization original painting patterns period physical plains Plateau political population present production range reach region relatively remains result rise River salinity Siberia soils Southeast southern species structure summer surface temperature theory tion trade traditional United valleys western winter zone