Volcano Degassing - John Seach

Degassing is the process by which magma loses its volatiles to the atmosphere.
Degassing can occur at craters or through the soil. An unknown large amount of gas
escapes through the soil at volcanoes. This phenomenon has not been extensively
studied. Some of the largest amounts of volcanic degassing ocurs through lava lakes.
 

Volcano Degassing
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Copyright John Seach