Ineed the definitions of: trench, rift zone, oceanic ridges, underwater mountain ranges, ring of fire, and fault. and what type of boundary is every single one.

trench-ditch

rift zone-is a feature of some volcanos

oceanic ridges-under water system

underwater mountain ranges-is a mid-ocean ridge 

ring of fire-is a area with volcanos and earth quakes

fault-planer rock fractures which show evidence of relative movement

answer; i believe the answer is (25%)plz check first good luck;