NASAのインスタグラム(nasa) - 4月26日 03時03分

Ice Scours the North Caspian Sea: Our Landsat 8 satellite acquired this large natural-color image showing a view of the Caspian Sea around the Tyuleniy Archipelago on April 16, 2016. An ocean scientist found a puzzling feature in the image -- lines crisscrossing the North Caspian Sea. On its own, the image was strikingly beautiful. Shallow waters surrounding the Tyuleniy Archipelago allow you to see the dark green vegetation on the sea bottom. But the question remained: what caused those lines? The dark green areas-possibly sea grass or benthic algae-and the lines are features of the sea bottom.
Image Credit: NASA image by Norman Kuring, NASA's Ocean Color web

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