description Great Sitkin fumaroles Overview
Great Sitkin fumaroles are steam and gas vents in the summit area of Great Sitkin, an active stratovolcano in Alaska's central Aleutian Islands. They form where heat from shallow magma and hot volcanic rock warms groundwater and drives gases such as water vapor, carbon dioxide, and sulfur compounds to the surface. The vents are part of a volcanic summit environment that can change as eruptive or geothermal activity changes, making them hazardous areas.
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