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| 239376118 | Silk Roads | a series of land-based trade routes that linked pastorial and agricultural communities throughout Eurasia | 1 | |
| 239376119 | Sea Roads | a series of sea-based trade routes that connected peoples all across the Eastern Hemisphere across the Indian Ocean | 2 | |
| 239376120 | Sand Roads | a series of land-based trade routes that liked North Africa and the Mediterranean world with the land and peoples of interior West Africa | 3 | |
| 239376121 | monsoons | alternating wind currents that blew predictably eastward during the summer months and westward during the winter | 4 |
