What are geothermal gases?

Geothermal gases come from volcanic activity deep within the Earth. In affected areas, gases sometimes rise to the Earth's surface through small cracks and other openings. The small openings in the ground where gases escape are called "fumaroles" or "vents". Hot springs result from the deep venting of hot water and may also contain gases.

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1. What are geothermal gases?
2. Are geothermal gases dangerous?
3. How can I tell if geothermal gases are present?