Low water: the Dead Sea, the lowest spot on Earth, is evaporating at an alarming rate.
图注：降低的水面：死海，地球的最低点，其水分正以惊人的速度蒸发。
It reported that fish kills can be caused by hypoxia, or low levels of oxygen in water, and the northern Gulf of Mexico is known as the largest so-called "dead zone" in the United States.
报道称，鱼的死亡可能是因为突然缺氧引起的，而且北部墨西哥湾有美国“死亡地带”之称。
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