By JEREMIE RICHARD / AFP In a dark auditorium in Reykjavik, bubbling orange lava flows down a slide to within inches of awe-struck visitors. 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. This is the Lava Show, Iceland’s latest tourist attraction, that uses reheated lava from a real eruption of the island’s Katla volcano more than 100 years ago. The heat emanating from the molten rock is tangible, so much so that some of the spectators shuffle…