What are passive continental margins characterized by?
Passive continental margins are characterized by all of the following except: shallow coastal waters. *deep-sea trenches. thick sediment accumulation.
Do passive or active margins have earthquakes and volcanoes?
Volcanoes and earthquakes are common at active margins. Active margins are near plate boundaries. Passive margins are passive. They have little or no geological activity.
Which of the following characterize active continental margins?
Active continental margins are those that are tectonically active, such as along much of the Pacific coast. Active margins are marked by earthquakes, volcanoes, and mountain belts. Unlike passive margins, they lack a continental rise and abyssal plain.
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 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 are the three parts of continental margin?
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 4 parts of the continental margin?
The continental shelf, slope, and rise are collectively called the continental margin.
What are the characteristics of a continental margin?
Major Continental Margin Features
What is the difference between a passive and active 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.
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 the difference between an active continental margin in a passive continental margin 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 are the two types of continental margins and how do they differ?
There are two types of continental margins: active and passive margins. Active margins are typically associated with lithospheric plate boundaries. Convergent active margins occur where oceanic plates meet continental plates. The denser oceanic plate subducts below the less dense continental plate.
What is a passive continental margin and an active margin give examples of each?
The west coast of the United States is an example of an active margin, where the coastline corresponds with the boundary between the Pacific and North America Plates. A passive continental margin occurs where the transition from land to sea is not associated with a plate boundary.
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 ).
What is the difference between continental slope and continental rise?
3 ” The continental slope is made of continental crust, but the continental rise is made of sediment. When sea level drops, parts of the continental shelves are the first to be exposed. The continental shelves are the shallowest parts of the continental margins, so if sea level drops, they are the first to be exposed.
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 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. The broad, gentle pitch of the continental shelf gives way to the relatively steep continental slope.
What is the continental rise the boundary of?
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 animals live in the continental rise?
Lobster, Dungeness crab, tuna, cod, halibut, sole and mackerel can be found. Permanent rock fixtures are home to anemones, sponges, clams, oysters, scallops, mussels and coral. Larger animals such as whales and sea turtles can be seen in continental shelf areas as they follow migration routes.
How deep is the abyssal plain?
10,000 feet
What color is the continental shelf?
light blue
What is a rise in oceanography?
A continental rise is a wide, gentle incline from a deep ocean plain (abyssal plain) to a continental slope. A continental rise consists mainly of silts, mud, and sand, deposited by turbidity flows, and can extend for several hundreds of miles away from continental margins.
What are the features of ocean basins?
A number of major features of the basins depart from this average”for example, the mountainous ocean ridges, deep-sea trenches, and jagged, linear fracture zones. Other significant features of the ocean floor include aseismic ridges, abyssal hills, and seamounts and guyots.
Which ocean has the greatest average depth?
The Pacific Ocean is the largest and deepest ocean basin on Earth, covering more than 155 million square kilometers (60 million square miles) and averaging a depth of 4,000 meters (13,000 feet).
How far does the continental ridge and rise system stretch?
500 km
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