Oceanic basin
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In hydrology, an oceanic basin is anywhere on Earth that is covered by seawater. Geologically, most of the ocean basins are large geologic basins that are below sea level.
This figure shows the main ocean basins as they are defined in "Limits of Oceans and Seas". The boundaries are based on geography of continents and the equator.
Movements of tectonic plates and the formation of oceanic ridges and trenches.
Passive margin
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A passive margin is the transition between oceanic and continental lithosphere that is not an active plate margin. A passive margin forms by sedimentation above an ancient rift, now marked by transiti
Rifting-to-spreading transition
Passive continental margin