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Is it a tree? A cross-section of veins and arteries?
According to the caption from NASA’s Earth Observatory, this satellite photo of the Yukon River in Alaska reveals the branches that break away from the main stem of the river as it reaches its delta region. The river empties into the Bering Sea. At this point, on January 11th, 2010, the sea is frozen along the shore, so you can’t tell where land meets sea. The frozen river is covered with snow, but the smaller branches stand out dark against the snowy surroundings.
