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Oceanic trench - Wikipedia
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9.2: Sea-Floor Spreading in the early 1900s, scientists using sonar (SOund Navigation And Ranging) discovered deep-ocean trenches deep-ocean trenches: - ppt download
deep-sea trench | geology | Britannica
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Ocean Trenches
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Mariana Trench: The Ocean's Deepest Point | Ocean Info
:max_bytes(150000):strip_icc()/exploring_marianas_june21-hires-59d6fb02af5d3a0011d51c42.jpg "Ocean Trenches: The Deepest Regions on Earth")