Volcanoes erupt frequently in Indonesia—this is linked to tectonic plate boundaries and subduction zones. Here's the science in simple terms

Indonesia's Lewotobi active Laki Lai volcano spewed searing miles-high ash column into the skies over Flores island, 440 miles east of Bali, grounding flights serving the popular tourist island all across the region.

All flights to and from the Indonesian resort island of Bali resumed on Thursday after being cancelled or delayed due to eruptions of Mount Lewotobi Laki-laki, officials said.