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UFfeatures, bottom
 submarine features
RTabyssal hills
 deep-sea environment
 abyssal plains
 ocean floors
 oceanography
 marine geology
 microcontinents
 mid-ocean ridges
 sand ridges
 benthonic taxa
 black smokers
 hydrothermal vents
 furrows
 gravity flows
 marginal basins
 pockmarks
 seamounts
 submarine can