Networks of Communication and Exhange, 300 BCE - 600 CE
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| 220034428 | Silk Road | Caravan routes connecting China and the Middle East across Central Asia and Iran | 0 | |
| 220034429 | Parthians | Iranian ruling dynasty between ca. 250 BCE and 226 CE | 1 | |
| 220034430 | Sasanid Empire | Iranian empire, established ca. 224, with a captal in Ctesphon, Mesopotamia. | 2 | |
| 220034431 | stirrup | Device for securing a horseman's feet, enabling him to wield weapons more effectively | 3 | |
| 220034432 | Indian Ocean Maritime System | A network of seaports, trade routes, and maritime culture linking countries on the rim of the Indian Ocean from Africa to Indonesia | 4 | |
| 220034433 | trans-Saharan caravan routes | Trading network linking North Africa with sub-Saharan Africa across the Sahara | 5 | |
| 220034434 | Sahel | Belt south of the Sahara; literally "coastland" in Arabic | 6 | |
| 220034435 | sub-Saharan Africa | portion of the African continent lying south of the Sahara | 7 | |
| 220034436 | steppes | Treeless plains, especially the high, flat expanses of northern Eurasia, which usually have little rain and are covered with coarse grass | 8 | |
| 220034437 | savanna | Tropical or subtropical grassland, either treeless or with a clup of trees occasionally | 9 | |
| 220034438 | tropical rain forest | High precipitation forest zones of the Americas, Africa, and Asia lying between the Tropic of Cancer and the Tropic of Capricorn | 10 | |
| 220034439 | "great traditions" | Historians' term for a literate, well institutionalized complex of religios and social beliefs and practices adhered to by diverse societies over a broad geographical area | 11 | |
| 220034440 | "small tradition" | Historians' term for a localized, usually non-literate, set of customs and beliefs adhered to by a single society | 12 | |
| 220034441 | Bantu | Collective name for a lange group of sub-Saharan African languages and of the people speaking these languages | 13 | |
| 220034442 | Armenia | One of the earliest Christian kingdoms, situated in eastern Anatolia and the western Caucasus and occupied by speakers of the Armenian language | 14 | |
| 220034443 | Ethiopia | East African highland nation lying east of the Nile River | 15 |
