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| | Neolithic period on Encyclopedia.com (Site not responding. Last check: 2007-10-20) |
 | | (the Neolithic revolution and the shift to an agricultural ec... |
 | | In the Tigris and Euphrates river valleys, the Neolithic culture of the Middle East developed into the urban civilizations of the Bronze Age by 3500 BC Between 6000 BC and 2000 BC Neolithic culture spread through Europe, the Nile valley (Egypt), the Indus valley (India), and the Huang He valley (N China). |
 | | By 1500 BC, Neolithic cultures based on the cultivation of corn, beans, squash, and other plants were present in Mexico and South America, leading to the rise of the Inca and Aztec civilizations and spreading to other parts of the Americas by the time of European contact. |
| www.encyclopedia.com /html/N/Neolithi.asp (582 words) |
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