What’s been driving Hawaii’s lava fountains?
In most cases, hotspot-driven volcanism is relatively sedate, with lava flowing down mountainsides slowly enough that people can walk out of its way. But in a number of locations—Mount Etna, Hawaii, Iceland—lava gets expelled in dramatic fountains that can reach several hundred meters in height. Right now, we're not sure what powers them. However, thanks to a recent set of…