Problem: Why has the Aral Sea lost 90 percent of its water over the last 40 years? View Available Hint(s)for Part B The Aral Sea has lost 90 percent of its water because of decreases in mean global sea level. The Aral Sea has lost 90 percent of its water because the rivers that feed the Aral Sea are being diverted for urban drinking water. The Aral Sea has lost 90 percent of its water because the rivers that feed the Aral Sea have been diverted for cotton production over the past 40 years. The Aral Sea has lost 90 percent of its water because the region has experienced a 50 percent drop in precipitation over the past 40 years. The Aral Sea has lost 90 percent of its water because the rivers that feed Lake Aral are being diverted for the region's nuclear power plants.