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Grand Prismatic Spring
The Grand Prismatic Spring in Yellowstone National Park is the largest hot spring in the United States, and the third largest in the world,〔(【引用サイトリンク】publisher=U.S. Geological Survey )〕 after Frying Pan Lake in New Zealand and Boiling Lake in Dominica. It is located in the Midway Geyser Basin.
Grand Prismatic Spring was noted by geologists working in the Hayden Geological Survey of 1871, and named by them for its striking coloration. Its colors match the rainbow dispersion of white light by an optical prism: red, orange, yellow, green, and blue.〔() Origin of name〕
==History==
The first records of the spring are from early European explorers and surveyors. In 1839, a group of fur trappers from the American Fur Company crossed the Midway Geyser Basin and made note of a "boiling lake", most likely the Grand Prismatic Spring, with a diameter of . In 1870 the Washburn-Langford-Doane Expedition visited the spring, noting a geyser nearby (later named Excelsior).
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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