<P> Geologically , an oceanic basin may be actively changing size or may be relatively , tectonically inactive , depending on whether there is a moving plate tectonic boundary associated with it . The elements of an active - and growing - oceanic basin include an elevated mid-ocean ridge , flanking abyssal hills leading down to abyssal plains . The elements of an active oceanic basin often include the oceanic trench associated with a subduction zone . </P>
<P> Geologically , an oceanic basin may be actively changing size or may be relatively , tectonically inactive , depending on whether there is a moving plate tectonic boundary associated with it . The elements of an active - and growing - oceanic basin include an elevated mid-ocean ridge , flanking abyssal hills leading down to abyssal plains . The elements of an active oceanic basin often include the oceanic trench associated with a subduction zone . </P>
what is the deepest part of the ocean basin
what is the deepest part of the ocean basin
abyssal plains
abyssal plains