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A squid, about 50 centimeters (20 inches) long, glides over a sheet flow on the seafloor. (Photo by Woods Hole Oceanographic Institution)

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Today divers in Alvin came across this collapsed pit in lava on the seafloor. Scientists call these shelf-like structures “bathtub rings,” because they record the different levels of lava before it drains through tubes and fissures. (Photo by Adam Soule)

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