Oceanic trench the level of the surrounding oceanic floor. The greatest ocean depth measured is in the Challenger Deep of the Mariana Trench, at a depth of below sea level. Oceanic lithosphere moves into trenches at a global rate of about 3 km/yr. There are approximately of convergent plate margins, mostly around the Pacific Ocean—the reason for the reference “Pacific-type” margin—but they are also in the eastern Indian Ocean, with relatively short convergent margin segments in the Atlantic Ocean and in the Mediterranean Sea. Globally, there are over 50 major ocean trenches covering an area of 1.9 million km or about 0.5%
Joseph Trench 27, 1879. Buildings designed by Trench's firm in New York City include: Trench also designed row houses which are part of the East 10th Street Historic District. Joseph Trench Joseph Trench (1815-1879) was an American architect who practiced in New York City and San Francisco in the 19th century. Trench was born in 1815, but little is known about his early history or training. By 1837 he was practicing in New York, and brought Jasper Francis Cropsey, who would go on to be a notable Hudson River school painter, into his office as an apprentice and draftsman. Several years later,