Hawaii Volcano Observatory

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Hawaiian Volcano Observatory

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Authorized by Congress in 1879, the US Geological Survey (USGS) Library is recognized as one of the world’s largest Earth and natural science …

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Frequently asked questions

Q:
What gases are emitted by Kīlauea and other active volcanoes?
A:
Ninety-nine percent of the gas molecules emitted during a volcanic eruption are water vapor (H 2 O), carbon dioxide (CO 2 ), and sulfur...
A:
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