< p >最深的位置都是在< a href = " https://en.wikipedia.org/wiki/Subduction " rel = " nofollow noreferrer " >俯冲< / >区域/战壕,其中一个< a href = " https://en.wikipedia.org/wiki/Plate_tectonics " rel = " nofollow noreferrer " >板块< / >是被拖下另一个。俯冲角越大越大潜力海沟的俯冲带的深度。最严重的地区有俯冲角度大于70度。< / p > < p >的俯冲角< a href = " https://en.wikipedia.org/wiki/Mariana_Trench " rel = " nofollow noreferrer " >马里亚纳海沟< / >是迄今为止已知的最大。Such angles only occur where "Earth's oceanic crust and lithosphere are old and thick and have, therefore, lost buoyancy". The oceanic crust of the Mariana Trench is from the Jurassic age and is among the oldest crusts on Earth.
For an ocean trench to be deeper than the Mariana Trench its geology would need to be of similar age.