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Ring Around the Tub

Ring Around the Tub

Researchers in the Alvin submersible came across this collapsed pit of lava on the seafloor near the Galapagos Rift. Marine geologists call these shelf-like structures “bathtub rings,” because they record the different levels (or heights) of lava before it drains through tubes and fissures back into the Earth or to a downhill spot on the seafloor. (Photo by Adam Soule, Woods Hole Oceanographic Institution)


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