The USGS is the Nation's largest water, earth, and biological science and civilian mapping agency. We provide science about natural resource conditions and problems.
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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 2O), carbon dioxide (CO 2), and sulfur dioxide ...
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