他们说在恐龙及地球上有任何走动的生物之前，河流只是非常宽阔的水面，只是服从重力的影响，直接流向大海。
They say that well before dinosaurs or, really, much of anything roamed the earth, rivers were just vast expanses of water heeding only gravity and heading straight to sea.
《地质学》和《地球科学评论》上的一项研究表明古代的河流是笔直宽阔的水面。
Studies in the journals Geology and Earth-Science Reviews reveal that ancient rivers were broad straight sheets of water.
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。
Low water: the Dead Sea, the lowest spot on Earth, is evaporating at an alarming rate.
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