The Challenger expedition used multibeam echo sounders to contour the seafloor.
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Q21: Guyots are often formed near spreading centers.
Q22: s ediments are found on the deep-ocean
Q23: What methods do scientists use to determine
Q24: A seamount is a volcanic projection that
Q25: Hydrothermal vents such as black smokers are
Q27: Abyssal plains and abyssal hills cover about
Q28: The mid-ocean mountains, such as the ridges
Q29: Abyssal plains and abyssal hills cover a
Q30: Abyssal hills are small extinct volcanoes commonly
Q31: A depression along the boundary of a
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