WHAT IS OCEAN RELIEF ?
#Geography #oceanography #upsc
Ocean relief is the outcome of the great depressions of the earth's outer layer mostly on the bottom surface.
Ocean relief is largely due to Tectonic, volcanic, erosional and depositional processes and their interactions.
Ocean relief controls the motion of sea water.
Oceanic movements in the form of currents, in turns, causes many variations in both ocean and atmosphere.
Bottom relief of oceans also influences navigation and fishing.
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■MAJOR OCEAN RELIEF FEATURES.
#geography #oceanography #GS1
1. CONTINENTAL SHELF.
Continental shelf is gently sloping (gradient of 1°C or less) seaward extension of Continental plate.
Shelves cover 7.5% of total area of the Oceans.
Shelf typically ends at very steep slope, called the Shelf break.
2. CONTINENTAL SLOPE.
◇ Gradient of slope region varies between 2-5°C.
◇ Continental slope boundary indicates the end of Continents.
◇ Canyons and trenches are observed in this region.
3. CONTINENTAL RISE.
◇ Continental slope gradually loses its steepness with depth.
◇ When slope reaches a level of between 0.5° and 1°, it is referred to as the Continental rise.
4. DEEP SEA PLAIN or ABYSSAL PLAIN.
◇ Deep sea plain are gently sloping areas of the ocean basins.
◇ They are flattest and smoothest regions of the world.
◇ These plains are covered with fine - grained sediments like Clay and silt.
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