develop where oceanic lithosphere bends downward and sinks into the mantle

Develop Where Oceanic Lithosphere Bends Downward And Sinks Into The Mantle?

Chapters 9-16
The presence of which one of the following would indicate that the land had been uplifted or that sea level had fallen?elevated marine terrace
________ develop where oceanic lithosphere bends downward and sinks into the mantle.Deep ocean trenches

What marks the site where old oceanic lithosphere begins its descent into a subduction zone?

ocean trench When old oceanic crust is descending into a subduction zone this forms an ocean trench. This means the answer is : A trench marks the site where old, oceanic lithosphere begins its descent into a subduction zone.

Where is the continental rise quizlet?

A steep underwater slope that reaches from the edge of the continental shelf to the continental rise. What is a continental rise? The transition between a continental slope and an abyssal plain that slopes gently.

What is the gently sloping submerged surface extending from the shoreline?

continental shelf A continental shelf is the gently sloping submerged surface extending from the shoreline.

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Why are there virtually no sediments at ocean ridges even when they are close to land?

Why are there virtually no sediments at ocean ridges, even when they are close to land? A) The sediments get buried by volcanic rocks, so are not visible.

What continental margins occur where oceanic lithosphere?

continental margins occur where oceanic lithosphere is being subducted beneath the edge of a continent. List two sources for the salts in seawater. Chemical weathering of rock on the continents, Earth’s interior. A(n) __________ is the vast, deep, flat, sediment-covered portion of the deep-ocean basin.

Where are seamounts formed?

Seamounts are commonly found near the boundaries of Earth’s tectonic plates and mid-plate near hotspots. At mid-ocean ridges, plates are spreading apart and magma rises to fill the gaps.

Where is the continental rise is located?

The continental rise is the gently inclined slope between the base of the continental slope and the deep ocean floor. It overlies the ocean crust bordering the faulted and fractured continental margin.

How are abyssal plains formed?

Abyssal plains result from the blanketing of an originally uneven surface of oceanic crust by fine-grained sediments, mainly clay and silt. Much of this sediment is deposited by turbidity currents that have been channelled from the continental margins along submarine canyons into deeper water.

How are abyssal plains formed quizlet?

How are abyssal plains formed? Abyssal plains are deep, extremely flat features of the ocean floor. They are formed as sediments from coastal regions are transported far out to sea and settle to the ocean floor, and as materials from the water column above settle to the bottom.

What is the name of the gently sloping submerged surface extending from the shoreline toward the deep ocean quizlet?

is the gently sloping submerged surface extending from the shoreline. slope is the steeply sloping edge of the continental shelf that drops to the ocean basin floor, marking the seaward edge.

What is the gently sloping surface at the base of the continental slope?

ES Chapter 14 Vocabulary Review
continental risethe gently sloping surface at the base of the continental slope
continental shelfthe gently sloping submerged portion of the continental margin, extending from the shoreline to the continental slope

What causes underwater canyons at continental margins?

The formation of submarine canyons is believed to occur as the result of at least two main process: 1) erosion by turbidity current erosion; and 2) slumping and mass wasting of the continental slope. … Many canyons have been found at depths greater than 2 km below sea level.

Where does the energy come from that drives surface ocean currents like the Gulf Stream?

Large-scale surface ocean currents are driven by global wind systems that are fueled by energy from the sun. These currents transfer heat from the tropics to the polar regions, influencing local and global climate.

How do ridges form?

A mid-ocean ridge or mid-oceanic ridge is an underwater mountain range, formed by plate tectonics. This uplifting of the ocean floor occurs when convection currents rise in the mantle beneath the oceanic crust and create magma where two tectonic plates meet at a divergent boundary.

What is Seamount quizlet?

What is a seamount? An active volcano that occurs along the crest of the mid-ocean ridge. … Seamounts subside as tectonic plates move. Coral reefs grow away from the seamount in order to stay near the sunlight.

Where is new oceanic lithosphere formed?

mid-ocean ridges New oceanic lithosphere is formed by frequent volcanic eruptions along the length of mid-ocean ridges and is pushed outward from them gradually. Old oceanic lithosphere is destroyed when it subducts or dives beneath adjacent plates at subduction zones.

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Where does new oceanic lithosphere form?

midocean ridges

Seafloor Processes Oceanic lithosphere forms at midocean ridges, where hot magma upwells, and then cools to form plates as the material moves away from the spreading center.

What is the ocean basin floor?

ocean-basin floor The ocean floor in those parts of the oceans that are more than 2000 m deep. It occupies approximately one-third of the Atlantic and Indian Ocean floors, and three-quarters of the Pacific Ocean floor. A Dictionary of Earth Sciences.

How are seamounts and Guyots formed?

Seamounts and Guyots are volcanoes that have built up from the ocean floor, sometimes to sea level or above. Guyots are seamounts that have built above sea level. Erosion by waves destroyed the top of the seamount resulting in a flattened shape. … After a long time, waves have eroded the portion above sea level.

When was the ocean formed?

about 3.8 billion years ago

The ocean formed billions of years ago. Water remained a gas until the Earth cooled below 212 degrees Fahrenheit . At this time, about 3.8 billion years ago, the water condensed into rain which filled the basins that we now know as our world ocean.Apr 9, 2021

What is the meaning of seamounts?

A seamount is an underwater mountain formed by volcanic activity. … Seamounts — undersea mountains formed by volcanic activity — were once thought to be little more than hazards to submarine navigation.

What is oceanic rise?

Wiseman and Ovey (1953) present the term oceanic rise as a long and broad elevation of the deep seafloor that rises gently and smoothly, and a ridge is considered to have steeper sides and less regular topography than a rise.

What creates the continental rise?

Continental rises form as a result of three sedimentary processes: mass wasting, the deposition from contour currents, and the vertical settling of clastic and biogenic particles.

How was the continental slope formed?

Over geologic time, the continental slopes are temporary depositional sites for sediments. During lowstands of sea level, rivers may dump their sedimentary burden directly on them. Sediments build up until the mass becomes unstable and sloughs off to the lower slope and the continental rise.

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How do oceanic trenches form?

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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