大自然的蓝色奇迹(Nature’s blue wonder)

这张照片没有经过编辑——奥地利阿尔卑斯地区的斯泰尔河真的是这么蓝。这条河流经Totes Gebirge（死亡山脉），这里指的是一些几乎没有植被的地区，但不是这张照片拍摄的地方！那么，一条从如此死气沉沉的地方流下来的河流，怎么会有如此生机勃勃的水流呢？答案就在山里。当有降雨或周围的雪融化时，被侵蚀的沉积物会流入河流。较重的沉积物沉入海底，较细的沉积物悬浮在水中。阳光被沉积物散射或反射，使我们能够看到美丽明亮的蓝色阴影。因此，这条色彩缤纷的小溪既美观又告诉了我们它的内容。
原文：
This photo hasn’t been edited—the Steyr river in Austria’s Alps region is really this blue. The river flows through the Totes Gebirge (Dead Mountains), which refers to some areas with almost no vegetation—but not where this picture was taken! So how does a river descending from such a lifeless place have such vibrant water? The answer is found in the mountains themselves. When there’s rainfall or the surrounding snow melts, eroded sediment flows into the river. Heavier sediment sinks to the bottom and finer sediment stays suspended in the water. Light from the sun is scattered or reflected by the sediment, allowing us to see a beautiful, bright shade of blue. As such, this colourful stream is both beautiful to behold and tells us about its content.
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