Geography
As crucial as rivers and marshlands were to the rise of civilization in the Fertile Crescent, they were not the only factor in the area's precocity. The area is important as the "bridge" between Africa and Eurasia. This "bridging role" has allowed the Fertile Crescent to retain a greater amount of biodiversity than either Europe or North Africa, where climate changes during the Ice Age led to repeated extinction events when ecosystems became squeezed against the waters of the Mediterranean Sea. Coupled with the Saharan pump theory, this Middle Eastern land-bridge is of extreme importance to the modern distribution of Old World flora and fauna, including the spread of humanity.
The area has borne the brunt of the tectonic divergence between the African and Arabian plates and the converging Arabian and Eurasian plates, which has made the region a very diverse zone of high snow-covered mountains, fertile broad alluvial basins and desert plateau, which has also increased its biodiversity further and enabled the survival into historic times of species not found elsewhere.
Read more about this topic: Fertile Crescent
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