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Writing and the wheel in Africa
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[QUOTE]Originally posted by Oshun: [QB] [QUOTE]CLyde says: The absence of navigable rivers in Africa is a recent phenomena, that is why we find engravings of boats throughout the Sahara dating to periods before the Sahara became a desert. Climate/enviro factors no doubt has changed the watery landscape once allowing boats in the Sahara. The time periods & amount of change varies over time. Africa has always had navigable rivers but the crucial point is (a) how far they were navigable internally before being interrupted by sandbars, rapids or cataracts, and (b) their access to the sea without continual interruption. Other factors include unpredictable rainfall that makes water levels fluctuate problematically. Another is how navigable by large vessels. It has been estimated that long stretches of the Niger Riger can only handle barges below 20 tons during the low-water level dry season. Whereas the Yangtse River in China can handle huge barges weighing in at 10,000 tons going hundreds of miles inland without interruption at any time. All the above just points out that substantial movement of materials and technology is not as easy in many parts of Africa as in other places. It does not mean Africans did not master boat technology. They did, long before others. And it is true that Africans had navigation knowledge as well. [/QUOTE]A friend asked me for more data on this and it made me think about the new suggestions of African agriculture and urbanization dating back very far. so I'm back. Just wondering Do you have any studies on the problems with African rivers? How much China's rivers can hold and stuff. I tried to give them some but I'd like to know if you've got any more. [/QB][/QUOTE]
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