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Which feature is commonly found near active continental margins?
An active continental margin is found on the leading edge of the continent where it is crashing into an oceanic plate. An excellent example is the west coast of South America. Active margins are commonly the sites of tectonic activity: earthquakes, volcanoes, mountain building, and the formation of new igneous rock.
Which feature is associated with an active continental margin quizlet?
-It is most likely a deep-ocean trench because they are common along the active continental margins. – It is most likely a deep-ocean trench because they are common along the margins of the Pacific Ocean. – The feature was most likely caused by one oceanic crust subducting under a leading edge of a continent.
What are the features of the continental margin describe each feature?
The continental shelf is the relatively shallow water area found in proximity to continents. 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 does the continental margin include?
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 …
Why are there no continental rises on active margins?
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 are some of the features of the west coast active continental margin and the Gulf Coast passive continental margin )?
The West Coast of the United States is an active margin that is characterized by rugged coastlines with narrow beaches and steep sea cliffs. Passive continental margins occur where the transition between oceanic and continental crust which is not an active plate boundary.
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.
Which is not a zone included in the continental margin?
The continental margin consists of the seabed and subsoil of the shelf, the slope and the rise. It does not include the deep ocean floor with its oceanic ridges or the subsoil thereof .
Is West Africa is an active continental margin?
Abstract. The West African region is bounded by a passive continental margin confined to a steadily subsiding zone. It covers sedimentary basins that extend to the deep-water areas of the Atlantic Ocean; they are the Gulf of Guinea, Cuanza-Cameroonian, and Namibian basins.
Is the Atlantic Ocean passive or active?
The Atlantic and Gulf coasts are passive continental margins because they lack the high levels of earthquake, volcanic, and mountain-building forces characteristic of active continental margins (such as the current U. S. West Coast) that are right at plate boundaries.
What are the characteristics of active and passive continental margins?
Characteristics of active continental margins include: The West Coast of the United States is an active margin that is characterized by rugged coastlines with narrow beaches and steep sea cliffs. Passive continental margins occur where the transition between oceanic and continental crust which is not an active plate boundary.
What is the difference between a submergent and an active margin?
Submergent coasts are associated with passive continental margins with wide coastal plains and continental shelves. Estuaries are associated with submergent coastlines formed when sea level rises and floods existing river valleys. Active margins can have both emergent and submergent coastlines in close proximity to each other.
What type of tectonic activity occurs at active margins?
Active margins are commonly the sites of tectonic activity: earthquakes, volcanoes, mountain building, and the formation of new igneous rock. These are often marked by uplift and volcanic mountain belts on the continental plate, and by island-arc chains on the oceanic plate.
What is the transition between continental and oceanic crust called?
The transition between the continental and oceanic crust that was originally created by rifting is known as a passive margin. Passive margins are found at every ocean and continent boundary that is not marked by a strike-slip fault or a subduction zone.