アメリカ内務省のインスタグラム(usinterior) - 10月9日 00時06分

Great Fountain #Geyser in #Yellowstone National Park has spectacular eruptions once or twice daily. To erupt, geysers require a heat source, plentiful water and a special plumbing system that includes a constriction. Eruptions occur when superheated water in the geyser tube suddenly flashes into steam, expanding 1500 times. Steam propels the water skyward, erupting as a geyser. #Wyoming

[BIHAKUEN]UVシールド(UVShield)

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