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Ocean trenches are a result of tectonic activity, which describes the movement of the Earth’s lithosphere. … At many convergent plate boundaries, dense lithosphere melts or slides beneath less-dense lithosphere in a process called subduction, creating a trench.
Where are abyssal hills found?
The greatest abundance of abyssal hills occurs on the floor of the Pacific Ocean. These Pacific Ocean hills are typically 50–300 m in height, with a width of 2–5 km and a length of 10–20 km.
What directly underlies the abyssal plain?
Geology. An average of 1.1 kilometers (0.68 mi) of exclusively deep-sea sediments, resting upon oceanic crust, underlies the Madeira Abyssal Plain. … Immediately overlying the oceanic crust is a layer of hemipelagic sediments.
Where are abyssal plains most common quizlet?
Where are abyssal plains most common? What are abyssal plains and how are they formed? Flat areas of the ocean floor, situated between ocean trenches and continental rises. Found between 3000 – 6000m .
What type of ocean sediment is formed from the shells and skeletons of living organisms?
Biogenous sediments are composed of the remains of marine organisms, and come from organisms like plankton when their exoskeletons break down. Hydrogenous sediments come from chemical reactions in the water, and are formed when materials that are dissolved in water precipitate out and form solid particles.
Where do phosphate rich nodules form?
Sediments derived from weathered rock and volcanic activity are called biogenous sediments. Phosphate nodules are found on the continental shelf. buried in the sediment.
Is an example of the earliest stage in the formation of a new ocean basin?
Continental rift valleys represent the earliest stage in the development of a new ocean basin as a single continental plate splits into two fragments as new oceanic crust grows between them.
Do submarine canyons form the deepest parts of the ocean floor?
Submarine canyons form the deepest parts of the ocean basins. The average height of the continents above sea level is greater than the average depth of the ocean basins below sea level.
What is a poleward moving ocean current?
A poleward-moving ocean current is considered a warm current. … -Cold currents off the western coast of South Africa cause locations at higher latitudes to be cooler than summers at slightly lower latitudes.
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