deep sea trenches
Deep sea trenches are found near chains of active volcanoes. These volcanoes can be at the edges of continents or in the oceans. Trenches are the deepest places on Earth. The deepest trench is the Mariana Trench in the southwestern Pacific Ocean. This trench plunges about 11 kilometers 35,840 feet beneath sea level. The ocean floor does have lots of flat areas. These abyssal plains are like the scientists had predicted.