The Ocean

Some Quick facts about the Ocean:

• The deepest known point on Earth is at the bottom of the Mariana Trench, a depression in the floor of the western Pacific Ocean, just east of the Mariana Islands. The Mariana Trench is 1,554 miles long and 44 miles wide. Near its southwestern extremity, 210 miles southwest of Guam, lies the deepest point on Earth. This point — referred to as the “Challenger Deep”— plunges to a depth of nearly 7 miles.
• The ocean bottom is divided into three major areas: the continental shelf, the continental slope, and the deep ocean basin.
• The Earth’s longest mountain range lies under the sea. Over 56,000 kilometers (35,000 mi) long, this mountain range, called the Mid-Ocean Ridge system, snakes its way around the globe.

Read more at http://www.ocean.udel.edu/deepsea/level-2/geology/deepsea.html