Are trenches caused from tectonic activity.
nope. it is a ggagaggagagaa apopo
false
No they are not.
what happens is the ocean floor does not just keep spreading.instead, it sinks beneath deep underwater canyons called deep- ocean trenches
In the ocean floor.
probably..
Deep Trench in the ocean floor. It can sometimes be mistaken for a mid-ocean ridge.
deep ocean currents form by the differences in the density of ocean water
the continental Margin, Ocean Basin Floor and Mid-Ocean ridge :D
an abyss
It is the Abyssal plain.
deep-ocean trench
deep-ocean trench