tourists view the sulphur banks that can be found walking along the boardwalk in volcanoes national park

acidity akulamanu attraction bank banks big bluff boardwalk can cracks crater dioxide egg emitted found fumes gas gases ground hawaii hiking hydrogen island magma national park pathways rim rotten soil steam steaming sulfide sulfur sulphur that tourist tourists trail vapor vaporizes vent vents view volcanic volcanoes wahinekapu walking water