"We concluded that, with current technology, a 'New-Frontiers-style' mission could feasibly perform a fly-through of one of Io's volcanic plumes to collect gas and dust ejected from its crust. This ...

(The lava field is likely covered with a smooth or glassy crust.) Io is blanketed in hundreds of erupting volcanoes because it's relentlessly locked in a tug-of-war between nearby objects ...