hydrothermal vents hydrothermal vents What is a hydrothermal vent? - National Ocean Service hydrothermal vents hydrothermal vents hydrothermal vents hydrothermal vents black smoker "A hydrothermal vent forms when seawater meets hot magma" noaa.gov hydrothermal vent What is a hydrothermal vent? - NOAA's National Ocean Service hydrothermal vents "A hydrothermal vent forms when seawater meets hot magma" 40 years ago hydrothermal vents hydrothermal ocean vents hydrothermal vents "A hydrothermal vent forms when seawater meets hot magma" hydrothermal vents 40 years ago http://oceanservice.noaa.gov/facts/vents.html black smokers hydrothermal vents