|WikiProject Volcanoes||(Rated Start-class, Mid-importance)|
Source of gases
- Usually it was already dissolved in the magma (see e.g. ), but evaporating groundwater is another possibility. -- Avenue (talk) 01:08, 2 June 2009 (UTC)
- Many volcanoes are caused by the the movement of the continental plates leading to the subduction and burying of sea floor. The buried sea floor material will obviously contain quite a lot of water. Above 375deg water cannot exist as a liquid and it becomes a gas although at the pressures involved in the magma it still occupies only a smallish volume. That is until the pressure is relieved when it expands explosively. Similarly fluorine is one of the commoner elements in the earth's crust, 950ppm. Hope this helps.ping (talk) 22:25, 18 June 2009 (UTC)
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