水的颜色
Much like the sky, rivers are rarely painted one color. Rivers around the world appear in shades of yellow, green, blue, and brown—and subtle changes in the environment can alter their colors. 就像天空一样,河流很少被涂成一种颜色。世界各地的河流呈现出黄色、绿色、蓝色和棕色的色调——环境的细微变化会改变它们的颜色。 New research shows the dominant color has changed in about one-third of large rivers in the continental U...