Oil was developed in Flanders, and it was during the Northern Renaissance.
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I believe that the answer to the question asked above is that in the villages they had an economy of farming crops and spoke the language of their ancestors while in the cities their economy was trade and spoke Arabic.
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Answer:
During the Middle Ages, the Catholic Church exerted enormous power over Europe. The Church influenced governments, waged wars and levied taxes. Although some actions, such as the Medieval Inquisition, are controversial today, the Catholic Church also established universities and hospitals, instigated positive social change and paved the way for economic growth.
The Neolithic revolution represents the transition from nomadic hunters and gatherers to settled societies, which practiced agriculture and farming.
This revolution enabled the development of the first civilizations; people started settling and building villages, but they needed a reliable source of water (year round) in order to maintain their crops, and feed the animals they also started to domesticate; most of these civilizations were stablished near rivers or lakes because of that.
The Yellow (or Yangtze) River provided that much needed water for the earliest chinese civilizations.
Pacific Ocean
The last one