Ocean trenches: Long depressions on the seafloor. They are the deepest parts of the ocean. Some ocean trenches are formed by subduction between oceanic plate and a continental plate.

Marianas Trench: it is the deepest part of the earth's oceans, and the deepest location of the earth itself.  It was created by ocean-to-ocean subduction

Mid-Ocean ridge:
Mid-ocean ridges are a series of largely underwater mountain ranges that are present beneath many seas of the world. Mid-ocean ridges are topographic features found where divergent tectonic plate processes are moving two pieces of oceanic crust away from each other.

San Andreas Fault:The san andreas fault is the plate that separate the pacific and the north american plate

Formations of Islands:There are 6 types of islands: Continental (1) Tidal(2) Barrier(3) Oceanic (4) Coral(5) Artificial(6). The continental ones are formed when 2 earth plates separate.

Formation of Mountains:they are the result of tectonic forces or volcanism.When two plates chush and one goes down and the other on goes up.

Fault:

In geology, a fault is rock mass movements that make significant displacement. Made because of constructive movements. Consequence: very hard sismics.