大海為什麼是藍色的？

The ocean is blue because water absorbs colors in the red part of the light spectrum. Like a filter, it leaves behind the colors in the blue part of the spectrum for us to see. The ocean can also look green, red or other colors when light bounces off sediment and tiny particles floating in the water. Most of the ocean, however, is completely dark. Very little light reaches deeper than about 200 meters (656 feet), and no light at all reaches deeper than 1,000 meters (3,280 feet).

大海之所以是藍色的，是因為水會吸收光譜中偏紅的顏色。水就像一片濾鏡，把光譜中偏藍的顏色留下來，讓我們看見。當光線照到水中漂浮的泥沙和微小顆粒並反射回來時，海水也可能呈現綠色、紅色或其他顏色。不過，海洋的絕大部分其實是一片漆黑。能照到約 200 公尺（656 英尺）以下的光非常少，到了 1,000 公尺（3,280 英尺）以下，就完全沒有光了。