Transport in river valley civilisations, Science

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River Valley civilisations were characterised by  settlements along the rivers and growth of cities which needed, among.other  things, stones and wood from distant places to make houses and monuments. Cities also signified that everyone need not depend on land. There was surplus production so that some people could trade or take up other occupations. The surplus had to be  traded for goods produced in different pans of the world.  For example, we have evidence  that Mesopotamians traded extensively with India through Bahrain.

Besides copper, the Indians exported peacocks and apes, ivory and ivory combs, pearls and some textiles.  In return, thev received silver and other commodities. Trade, as well as the'desire to control large territories,  led to the need for efficient transport. Since  the rivers were easy flowing, water transport was most probably developed first.  

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