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Ocean Floor

REGINALD JONES
Across
a gently sloping, shallow area that extends outward from the edge of a continent.
are long chains of mountains on the ocean floor
a volcanic mountain that rises from the ocean floor but doesn't reach the surface.
Down
a broad area covered with thick layers of mud and silt.
the steep edge of a continental shelf.
a long,deep valley on the ocean floor through which old ocean floor sinks back toward the mantle.