K. O. Emery has written:

'Atlantic continental shelf and slope of the United States' -- subject(s): Continental margins, Geology

'The sea off southern California' -- subject(s): Geology, Marine biology, Ocean bottom, Petroleum, Submarine geology

'Mineral deposits of the deep-ocean floor' -- subject(s): Marine mineral resources

'The geology of the Atlantic Ocean' -- subject(s): Geology, Geomorphology, Geophysics, Maps, Plate tectonics

Spreading is generally thought of when speaking of sea-floor spreading. Sea-floor spreading takes place at the mid-ocean ridge where two oceanic plates are spreading/pulling apart from one another.

The topography of the ocean floor

which landforms are on the ocean floor

The ocean floor is not smooth.The ocean floor is made up of rocks, ledges and ditches.