The popping rock was recovered from a section of the slow-spreading Mid-Atlantic Ridge near 14°N. It was dredged at the boundary between a ‘magmatic’ and a ‘tectonic’ segment and adjacent to an ...

“In the deeper part of the back arc, where there’s sea floor spreading, that’s more eruptions like you might see in Hawaii…hundreds of feet thick.” Hydrothermal vent zones, home to dense ...