What are main features of continental margins?

The continental margin consists of three different features: the continental rise, the continental slope, and the continental shelf. Continental margins constitute about 28% of the oceanic area.

What are three major features of a passive continental margin?

The features comprising passive continental margins include the continental shelf (the flooded extension of the continent), the continental slope (has the steepest slope), and the continental rise.

What margin features a continental rise?

The Deep Continental Margin The continental rise on a passive continental margin is a zone of sediment deposition on slopes that are typically between 1 : 50 and 1 : 500 and occurs beyond the steeper continental slope, which is commonly incised by canyons. The continental rise consists principally of submarine fans.

What features are associated with a passive continental margin?

The Atlantic and Gulf coasts show the classic form of a passive continental margin: a low-lying coastal plain, broad continental shelf, then a steep continental slope, gentle continental rise, and flat abyssal plain. This topography is a consequence of the transition from thick continental to thin oceanic crust.

What are the three types of continental margins?

The continental margins consist of three portions: (1) the continental shelf which has shallow water depths rarely deeper than 650 ft) and extends seaward from the shoreline to distances ranging from 12.3 miles to 249 miles, (2) the continental slope where the bottom drops off to depths of up to 3.1 miles, and (3) the …

What are the four components of the continental margin?

Major Continental Margin Features

What is a passive continental margin example?

A passive continental margin occurs where the transition from land to sea is not associated with a plate boundary. The east coast of the United States is a good example; the plate boundary is located along the mid Atlantic ridge, far from the coast. Passive margins are less geologically active.

What are some differences between an active and passive continental margin?

An active continental margin is found on the leading edge of the continent where it is crashing into an oceanic plate. … Passive continental margins are found along the remaining coastlines.

Where are passive continental margins most common?

Passive margins define the region around the Atlantic Ocean, Arctic Ocean, and western Indian Ocean, and define the entire coasts of Africa, Greenland, India and Australia. They are also found on the east coast of North America and South America, in western Europe and most of Antarctica.

What is an example of 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.

Is the continental rise active or passive?

Active margins are marked by earthquakes, volcanoes, and mountain belts. Unlike passive margins, they lack a continental rise and abyssal plain. Instead, the continental slope ends in an oceanic trench, and beyond the trench, the topography is hilly and irregular, often dotted with rugged volcanic seamounts.

What causes 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.

What’s a passive continental margin?

Passive continental margins occur where the transition between oceanic and continental crust which is not an active plate boundary. …

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.

Which is the largest continental shelf?

Notes: The largest continental shelf is the Siberian Shelf in the Arctic Ocean.

What are the types of continental?

Continental Margins

Continental margin Plate Boundary Nearby Continental shelf width
Active/Pacific type Conservative or destructive near margin Generally narrow
Passive/Atlantic type None. Constructive boundary has rifted away, and over time will be far away (mid-ocean) Generally wide

What do you mean by continental margin?

Continental margin, the submarine edge of the continental crust distinguished by relatively light and isostatically high-floating material in comparison with the adjacent oceanic crust. It is the name for the collective area that encompasses the continental shelf, continental slope, and continental rise.

Where is continental rise found?

The continental rise is a low-relief zone of accumulated sediments that lies between the continental slope and the abyssal plain. It is a major part of the continental margin, covering around 10% of the ocean floor.

What is a continental feature?

Continental landform, any conspicuous topographic feature on the largest land areas of the Earth. Familiar examples are mountains (including volcanic cones), plateaus, and valleys.

What is continental shape?

Continental margins are the zones between the ocean basin and the mass of the continent. … The continental shelf is the underwater region from the continental margin to the shoreline.

Which one is not part of the continental margin?

Which of the following is NOT part of the continental margin? coral reefs surrounding a lagoon. You just studied 65 terms!

What are active continental margins?

Definition. An active continental margin refers to the submerged edge of a continent overriding an oceanic lithosphere at a convergent plate boundary by opposition with a passive continental margin which is the remaining scar at the edge of a continent following continental break-up.

What are the parts of a passive continental margin quizlet?

Which type of continental margin has steeper mountains?

Active and passive margins. Earthquakes and volcanoes are associated with active continental margins, which are marked by a landward continental shelf, a much steeper continental slope that ends at an active ocean trench, and an irregular ocean bottom that may contain volcanic hills (Figure 1 ).

Is Japan a passive margin?

The early extensional phase of rifting may be marked by the deposition of red-beds and evaporites, and the extrusion of relatively alkaline and Ti-rich volcanic rocks. Developing oceans are classified as ‘passive’ (Atlantic), ‘active’ (Pacific), and ‘marginal’ (Sea of Japan; Phillipines).

Why do passive margins have no trenches?

Passive margins have no trenches because they do not have any tectonic plate activity. Tectonic plates are located under the earth’s surface and move…

Is California a passive continental margin?

Active Margins The continental margin of western North America is near a set of plate boundaries. … Western North America has a lot of volcanoes and earthquakes. Mountains line the region. California, with its volcanoes and earthquakes, is an important part of this active margin (Figure below).