Biology 210 with Walsh at Trident Technical College *. * The material on this site is created by StudyBlue users. StudyBlue is not affiliated with, sponsored by or endorsed by the academic institution or instructor.
Mid-ocean ridges (eg. Mid Atlantic Ridge) are formed at constructive plate boundaries, where magma is welling up between two diverging plates and forming new plate materiel. Trenches (eg. Marianas Trench) are formed at destructive plate boundaries where an ocean plate is being subducted below a continental plate.Chariotmender Â· 8 years ago.id Atlantic Ridge) are formed at constructive plate boundaries, where magma is welling up between two diverging plates and forming new plate materiel. Trenches (eg. Marianas Trench) are formed at destructive plate boundaries where an ocean plate is being subducted below a continental plate. Chariotmender Â· 8 years ago.
Report Abuse. A trench is due to the convergence of two oceanic plates. One is subducted under the other and forms a deep trench. A mid-ocean ridge is due to sea floor spreading.There, two oceanic plates are being pushed apart due to the formation of new sea floor. This new sea floor creates a large ridge.eport Abuse. A trench is due to the convergence of two oceanic plates. One is subducted under the other and forms a deep trench. A mid-ocean ridge is due to sea floor spreading.