Detailed mapping of the ocean bottom around the Hawaiian Islands revealed a previously unrecognized tsunami source. What did geologists discover on the seafloor in this area?
A. a system of major oceanic transform faults
B. slumps and debris avalanches formed by volcanic flank collapse
C. a major undersea volcano
D. a huge undersea meteor crater
E. a deep ocean trench along a subduction zone
Answer: B
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