Image: Deep sea vent chimneys with Alvin for scale
Caption: formation of chimneys around hydrothermal vents on the sea floor, with a deep-sea submersible on the upper right for scale. Phenomena such as these vents, as well as microbial food webs and plate tectonics, have been discovered since the 1960s by ship-based expeditions.
Source: John Delaney, University of Washington School of Oceanography
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