There are four features active in Volcano National Park:
1) a lake of lava in the active caldera
2) surface lava oozing slowly across a plain
3) groundwater that is heated to steam and vented
4) sulphur vents
This last one is pictured. It shows volcanic gasses (plus a bit of steam from groundwater) precipitating native sulphur at the vent opening. Unlike regular steam vents, the sulphur is evidence of a channel from here all the way down to the magma.
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