GEOLOGY

Detailed explanation-1: -Ocean trenches are long, narrow depressions on the seafloor. These chasms are the deepest parts of the ocean-and some of the deepest natural spots on Earth.

Detailed explanation-2: -Abyssal plains are broad, flat areas that lie at depths of about 4, 000 to 6, 000 meters (13, 123 to 19, 680 feet). Abyssal plains cover 30 percent of the ocean floor and are the flattest feature on Earth. They are covered by fine-grained sediment like clay and silt.

Detailed explanation-3: -The deepest part of the ocean is called the Challenger Deep and is located beneath the western Pacific Ocean in the southern end of the Mariana Trench, which runs several hundred kilometers southwest of the U.S. territorial island of Guam. Challenger Deep is approximately 10, 935 meters (35, 876 feet) deep.