アメリカ内務省のインスタグラム(usinterior) - 2月18日 06時56分

Right now, there are 169 potentially active volcanoes in the U.S. & @Usgsvolcanoes monitors them all. There are five #volcano observatories across the country and the volcano scientists work to deliver forecasts, warnings and information about volcano hazards. This enhances public safety and minimizes social and economic disruption from volcanic unrest and eruption. Cool facts about hot lava? When it erupts the temperature is greater than 2000 °F. The color of it tells how hot it is - white/yellow= hotter, red/maroon = cooler. Hot lava actual produces a mild eruption and cooler lava produces more explosive eruptions. Video by Janice Wei, National Park Service. Sweet #usinterior #usgs #usgsvolcanoes

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