Wiktionary
oceanic trenches
n. (oceanic trench English)
Usage examples of "oceanic trenches".
Simultaneously, the ocean floor, which is continuously moving like a slow conveyer belt toward the oceanic trenches, carries the fossils into a high-pressure zone where the rock forms chondrules!
In the perpetual night of the oceanic trenches, six miles below the waves or adrift in the high atmosphere, one finds life.