In a dark auditorium in Reykjavik, bubbling orange lava flows down a slide to within inches of awe-struck visitors. The flow, contained on both sides by black sand, lights up the room like a sunrise.

Fountains of lava erupted from the Sundhnúkur volcanic system in southwest Iceland on Jan. 14, 2024. As the world watched on webcams and social media, lava flows cut off roads and bubbled from a new ...