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1. True
2. False. The ocean floor has mountains, plains, valleys, ridges, volcanoes and just about any other feature we see on land.
3. Deep-sea trenches. A Navy-owned submarine, the Trieste, still holds the record for deepest dive after journeying to the bottom of one deep-sea trench, the Marianas Trench, on January 23, 1960. The Trieste dove 35, 800 feet into a trench within the Mariannas Trench called Challenger Deep.
4. Continental margin
5. A seamount whose peak has been eroded and become a flat surface.
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