EARTH SCIENCE
OCEANS
|
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
|
|
|
It is water, or brack water, is freshwater mixed with seawater .
|
|
|
It is a large, flat area of the seafloor that extends across the deepest parts of ocean basins .
|
|
|
It is water from a sea or ocean that has an average salinity of 35 pp .
|
|
|
It is a measure of the mass of dissolved solids in a mass of water.
|
Detailed explanation-1: -The term ‘abyssal plain’ refers to a flat region of the ocean floor, usually at the base of a continental rise, where slope is less than 1:1000. It represents the deepest and flat part of the ocean floor lying between 4000 and 6500 m deep in the U.S. Atlantic Margin.
Detailed explanation-2: -At depths of over 10, 000 feet and covering 70% of the ocean floor, abyssal plains are the largest habitat on earth. Sunlight does not penetrate to the sea floor, making these deep, dark ecosystems less productive than those along the continental shelf. But despite their name, these “plains” are not uniformly flat.
Detailed explanation-3: -Abyssal plain: Flat or very gently sloping area of the deep ocean basin floor.
Detailed explanation-4: -Abyssal plains consist of beds of volcanic rock topped with sediments that are up to thousands of feet thick. Most of the sediments wash off the continents, and are carried to the depths by dense currents. Over time, the sediments spread out to provide a smooth, level surface.
Detailed explanation-5: -The abyssal zone, also known as the abyssopelagic zone, is one of the levels into which the oceans are divided and it is found between 3, 000 and 6, 000 metres below the surface. In fact, the word abyssal comes from the Latin abyssalis, meaning abyss, something bottomless or extremely deep.