Final answer:
The Tigris and Euphrates Rivers in the Fertile Crescent had both positive and negative impacts on ancient societies.
Explanation:
The two rivers that run through the Fertile Crescent are the Tigris and Euphrates Rivers. These rivers were positive to societies in the Fertile Crescent as they provided freshwater for irrigation, leading to agricultural productivity and the establishment of early civilizations. However, the rivers were also negative due to their unpredictable floods that could cause catastrophic damage to settlements.
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