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The hadal zone, also known as the hadopelagic zone, is the deepest region of the ocean, lying within oceanic trenches. The hadal zone ranges from around 6 to 11 km (3.7 to 6.8 mi; 20,000 to 36,000 ft) below sea level, and exists in long, narrow, topographic V-shaped depressions.[1][2] The cumulative area occupied by the 46 individual hadal habitats worldwide is less than 0.25% of the world's seafloor, yet trenches account for over 40% of the ocean's depth range.[3] Most hadal habitat is found in the Pacific Ocean, the deepest of the conventional oceanic divisions.[3] In the hadal zone The hydrothermal vents are present, basically under water volcano. there high amount of volcano are present. the vents temprature approximately 400 degree Celcius. On the earth, life formed in a hadal zone. Carbon, sulfer, hydrogen, phosphorus, oxygen, nitrogen these are very important to the life and these bonding with each other and the hadal zone's energy is very high so these elements go on the surface of the water and the life formed and few years later the life's developed in other species and few years later the life go on the surface and these life developing on the surface. hadal zone invented first life on the earth.