The New Encyclopaedia Britannica: Macropaedia : Knowledge in depth

20th century agriculture altitude ancient animals Arctic Ocean areas Argentina Aristotelian Aristotle Aristotle's arthropods artists Asian Athens Atlantic atmosphere atoms basin Buenos Aires carbon Caspian Central Asia centres China Chinese Chukchi climate coast countries culture delta deposits desert early east eastern economic electrons energy Eskimo ethnic Evenk exploration feet fish flow forest gases glaciers Greek Greenland groups Gulf Himalayas Hindu Kush important India Indus industrial irrigation Island Karakoram kilometres Lake land language lowlands major marginal Mediterranean metres miles million years ago modern mountains Myanmar northern O₂ organization oxygen Pakistan Paleozoic Pamirs particles patterns Peninsula plains Plateau political population production range region ridges river Russian Siberia slopes social soils Southeast Southeast Asia southern species steppe Strait summer surface temperature Tibet Tien Shan tion trade traditional tundra valleys western winter Yakut Yangtze Yenisey zone