Press "Enter" to skip to content

What are the boundaries of the continental shelf?

The term “continental shelf” is used by geologists generally to mean that part of the continental margin which is between the shoreline and the shelf break or, where there is no noticeable slope, between the shoreline and the point where the depth of the superjacent water is approximately between 100 and 200 metres.

What is the edge of the continental shelf called?

shelf break

What is the outer edge of the continental margin?

This portion of the seafloor is called the continental rise, and marks the outermost zone of the continental margin.

What is between the continental shelf and the continental rise?

The continental margin, between the continental shelf and the abyssal plain, comprises a steep continental slope, surrounded by the flatter continental rise, in which sediment from the continent above cascades down the slope and accumulates as a pile of sediment at the base of the slope.

What is an example of a continental rise?

The continental rise completely surrounds Antarctica covering 39.4% of the Southern Ocean (see Table), forming a halo of sediment surrounding the Antarctic continent. Example of continental rise (in yellow) and submarine fan (red) adjacent to the coast of southeastern Brazil.

What are the 4 parts of the continental margin?

The continental shelf, slope, and rise are collectively called the continental margin.

What is the most biologically rich part of the ocean?

Continental Margins

What is an example of a passive continental margin?

Examples of passive margins are the Atlantic and Gulf coastal regions which represent setting where thick accumulations of sedimentary materials have buried ancient rifted continental boundaries formed by the opening of the Atlantic Ocean basin. …

What is the best description of a passive margin?

Passive margins (also known as rifted margins) mark the sites where continents have rifted apart to become separated by an ocean. Thus, passive margins consist of a seawards tapering wedge of continental crust that is dissected by faults, overlain by sedimentary basins and juxtaposed with oceanic crust.

How does a passive continental margin form?

A passive margin forms by sedimentation above an ancient rift, now marked by transitional lithosphere. Continental rifting creates new ocean basins. Eventually the continental rift forms a mid-ocean ridge and the locus of extension moves away from the continent-ocean boundary.

What are two structures you would find at a passive continental margin?

There are two structures that would be found at a passive continental margin. These structures are continental shelves and continental slopes.

What is a conjugate margin?

A conjugate margin pair comprises two passive margins now located on different tectonic plates, separated by oceanic crust (including a spreading axis), which were once adjoined in the rift system that preceded the breakup.

What are the two types of continental margins quizlet?

The two types of continental margin are passive and active.

What is the continental shelf quizlet?

Continental shelf. a gently sloping, shallow area of the ocean floor that extends outward from the edge of a continent. Continental slope. the steep gradient that leads to the deep-ocean floor and marks the seaward edge of the continental shelf. Submarine canyons.

What is the difference between passive and active continental margins quizlet?

Terms in this set (3) Passive Continental Margins- Found along most coastal areas that surround the Atlantic Ocean. Not associated with plate boundaries. Active Continental Margins- where the oceanic lithosphere is being sub ducted beneath the continent. Often associated with deep ocean trenches.

What process es affect the shape and structure of continental shelves?

graded bedding. What process(es) affect the shape and structure of continental shelves? Turbidity currents are highly erosive and are thought to be responsible for the creation of deep-sea trenches.

What is called continental slope?

Continental slope – The slope is “the deepening sea floor out from the shelf edge to the upper limit of the continental rise, or the point where there is a general decrease in steepness” (IHO, 2008). On average, the slope is a narrow band ~41 km wide that encircles all continents and islands.

Where do we find the widest continental shelf?

Siberia

Where is the continental shelf narrowest?

The southern and northern ends are relatively wide, with width of 65–215 km; the middle is narrow, with the narrowest point of only 27 km. The slope edge of the continental shelf generally has water depth between 200 and 250 m.

What are the characteristics of continental crust?

Continental crust is broadly granitic in composition and, with a density of about 2.7 grams per cubic cm, is somewhat lighter than oceanic crust, which is basaltic (i.e., richer in iron and magnesium than granite) in composition and has a density of about 2.9 to 3 grams per cubic cm.