Ocean trenches definition of Ocean trenches in the Free Online Encyclopedia.

trench: see ocean ocean, interconnected mass of saltwater covering 70.78% of the surface of the earth, often called the world ocean. It is subdivided into four (or five) major units that are separated from each other in most cases by the continental masses. See also oceanography.
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trench [trench]

(geography)

A narrow, straight, elongate, U-shaped valley between two mountain ranges.

A narrow stream-eroded canyon, gulley, or depression with steep sides.

(geology)

A long, narrow, deep depression of the sea floor, with relatively steep sides. Also known as submarine trench.

trench

1. A creep trench.

2. A housing, 1.

Trench

in mining, an open excavation in the ground. A trench has a trapezoidal cross section, and its length is many times greater than its width.

Sloping main, or primary, trenches are used in stripping an opencut mine or an individual area of such a mine, and also in establishing a haulage system to link the working levels with the surface. A horizontal, or cross-sectional, trench is designed to establish the initial working front at a bench. In the case of irregular mountain terrain, a trench may have an irregular cross section (hasty trench).

Main trenches are classified on various bases. In terms of their relationship to the contours of the pit, they may be external or internal. They may be of the individual type (providing haulage for a single level), the group type (serving several levels), or the general type (for all working levels in the pit). On the basis of the traffic flow, they are classified as single trenches, with two-way traffic, and paired trenches, with one-way traffic.

The width of a horizontal trench depends on the location of the haulage system and excavation equipment in the horizon being stripped. The depth of a horizontal trench corresponds to the height of the horizon to be stripped. The optimum depth of an inclined main external trench is 50–60 m.

In pits with soft rock, trenches are excavated using multibucket excavators, dragline excavators, or scrapers; single-bucket excavators (trenchers) are used in pits with hard rock. Ejection explosions may be used in digging a trench. If conditions permit, the stripped rock is placed on the surface on one or both sides of the trench; otherwise, it is moved by vehicles to spoil banks.

The rate of excavation of trenches depends largely on the time required for construction of the pit and, in sloped and steeply inclined deposits, also on the productivity of the pit.

Trenches are also used in construction, for the laying of pipelines and cables.

IU. I. ANISTRATOV

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No references found	The deep sea animals are found in ocean areas such as continental margins to the spine- like ridge running down the mid- Atlantic, submerged mountains rising from the seafloor, muddy floor of ocean plains and the vents, seeps and chemically- driven ecosystems found on the margins of mid- ocean ridges and in the deepest ocean trenches. And you thought you were dumbo! by Mail Today (New Delhi, India) However, owing to factors such as the rotation of the planet, the effects of mountains and ocean trenches, and density variations in Earth's interior, this fundamental force is not quite the same all over. ESA's satellite sends data for development of best gravity map ever by Asian News International A new deep-sea vehicle under construction at Woods Hole Oceanographic Institution promises to have a lot of capabilities: It will dive to the deepest ocean trenches, operate as an autonomous vehicle for wide-area ocean surveys, and transform into a tethered vehicle for close-up sampling of seafloor rocks and organisms. Name that new, one-of-a-kind, deep-submergence vehicle by Oceanus	occupiable room occupied bandwidth occupy occurrence occurs check Ocean ocean basin ocean circulation Ocean City Ocean City State Park Ocean Conservancy Ocean County ocean current Ocean Currents ocean engineering ocean ferry Ocean Floor Ocean Futures Society Ocean Island ocean liner ocean perch ocean station vessel Ocean Sunfish ocean thermal-energy conversion ocean tomography Ocean trenches ocean weather station ocean-floor spreading ocean-going Oceana County Oceania Oceanian oceanic anticyclone Oceanic art Oceanic arts oceanic basalt oceanic climate oceanic crust Oceanic Discontinuities oceanic heat flow oceanic high oceanic island Oceanic languages Oceanic Meadow Zones Oceanic Noise oceanic plateau oceanic province Oceanic religions oceanic ridge oceanic rise oceanic stratosphere	Ocean Surveillance Aircraft Ocean Surveillance Analysis By Computer Ocean Surveillance Information System Ocean Surveillance Master Plan Ocean Surveillance Product Ocean Surveillance System Ocean Survey Program Ocean Survey Program Survey System Ocean Systems Engineering Corporation Ocean Systems for Chemical, Optical and Physical Experiments Ocean Systems Technician Analyst Ocean Systems Test and Evaluation Program Ocean Tactical Targeting Ocean Technological Information System Ocean Terrace Beach Club, Inc. Ocean thermal energy conversion Ocean Thermal Energy Conversion Systems Ocean Thermal Interpolation System Ocean Thermal Power Plant Ocean Thermal Structure ocean thermal-energy conversion ocean tomography Ocean Topography Experiment Ocean Trench Ocean Trench Ocean trenches ocean trip Ocean trout Ocean trout Ocean trout Ocean Turtles Ocean Turtles Ocean University of Qingdao Ocean Venture Ocean Versus Daughter Ocean View Ocean View Baptist Church Ocean View Community Association Ocean View Development Company Ocean View Elementary School Ocean View High School Ocean View Investment Ocean View PONY Baseball Ocean View Reading Center Branch Library Ocean View School District Ocean View Terrace Ocean View Veterinary Hospital Ocean Voice International Ocean water Ocean water Ocean Wave Energy Company Ocean Wave Energy Conversion Ocean Wave Massage Bed Ocean Weather Station Ocean Weather Station

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The deep sea animals are found in ocean areas such as continental margins to the spine- like ridge running down the mid- Atlantic, submerged mountains rising from the seafloor, muddy floor of ocean plains and the vents, seeps and chemically- driven ecosystems found on the margins of mid- ocean ridges and in the deepest ocean trenches.

And you thought you were dumbo! by Mail Today (New Delhi, India)

However, owing to factors such as the rotation of the planet, the effects of mountains and ocean trenches, and density variations in Earth's interior, this fundamental force is not quite the same all over.

ESA's satellite sends data for development of best gravity map ever by Asian News International

A new deep-sea vehicle under construction at Woods Hole Oceanographic Institution promises to have a lot of capabilities: It will dive to the deepest ocean trenches, operate as an autonomous vehicle for wide-area ocean surveys, and transform into a tethered vehicle for close-up sampling of seafloor rocks and organisms.

Name that new, one-of-a-kind, deep-submergence vehicle by Oceanus

Ocean Surveillance Aircraft
Ocean Surveillance Analysis By Computer
Ocean Surveillance Information System
Ocean Surveillance Master Plan
Ocean Surveillance Product
Ocean Surveillance System
Ocean Survey Program
Ocean Survey Program Survey System
Ocean Systems Engineering Corporation
Ocean Systems for Chemical, Optical and Physical Experiments
Ocean Systems Technician Analyst
Ocean Systems Test and Evaluation Program
Ocean Tactical Targeting
Ocean Technological Information System
Ocean Terrace Beach Club, Inc.
Ocean thermal energy conversion
Ocean Thermal Energy Conversion Systems
Ocean Thermal Interpolation System
Ocean Thermal Power Plant
Ocean Thermal Structure
ocean thermal-energy conversion
ocean tomography
Ocean Topography Experiment
Ocean Trench
Ocean Trench

Ocean trenches

ocean trip
Ocean trout
Ocean trout
Ocean trout
Ocean Turtles
Ocean Turtles
Ocean University of Qingdao
Ocean Venture
Ocean Versus Daughter
Ocean View
Ocean View Baptist Church
Ocean View Community Association
Ocean View Development Company
Ocean View Elementary School
Ocean View High School
Ocean View Investment
Ocean View PONY Baseball
Ocean View Reading Center Branch Library
Ocean View School District
Ocean View Terrace
Ocean View Veterinary Hospital
Ocean Voice International
Ocean water
Ocean water
Ocean Wave Energy Company
Ocean Wave Energy Conversion
Ocean Wave Massage Bed
Ocean Weather Station
Ocean Weather Station

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