Q. What type of plate boundary is usually associated with active continental margins?
lithospheric
Q. What are active and passive 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. Passive continental margins are found along the remaining coastlines.
Q. What are the 3 parts of the 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 …
Q. What is the best description of a passive margin?
A passive margin is the transition between oceanic and continental lithosphere that is not an active plate margin. A passive margin forms by sedimentation above an ancient rift, now marked by transitional lithosphere. Continental rifting creates new ocean basins.
Q. 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.
Q. Which one of the following is not part of the passive continental margin?
Geol 1610 Final
| Question | Answer |
|---|---|
| What technology do scientists use to map ocean floors | echo sounders |
| Which one of the following is NOT part of a passive continental margin | continental trench |
| Extinct volcanoes that “dot” the ocean basin floor are called | seamounts |
Q. Do passive margins have volcanic activity?
Volcanic passive margins are associated with the extrusion and intrusion of large volumes of magma, predominantly mafic and represent distinctive features of Larges Igneous Provinces, in which regional fissural volcanism predates localized syn-magmatic break-up of the lithosphere.
Q. Do passive margins have earthquakes?
Earthquakes like the August 2011 magnitude 5.8 Mineral, Va., temblor that occur on “passive” continental margins surprise people because they expect earthquakes to occur only on plate boundaries. But, in fact, large and damaging intraplate earthquakes occur fairly regularly on passive margins around the world.
Q. Which of the following parts of the ocean margins is only present in a passive margin?
CRs
Q. What is passive margin in geology?
Passive margins are areas 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.
Q. What is created along oceanic divergent boundaries?
Most divergent plate boundaries are underwater and form submarine mountain ranges called oceanic spreading ridges. While the process of forming these mountain ranges is volcanic, volcanoes and earthquakes along oceanic spreading ridges are not as violent as they are at convergent plate boundaries.
Q. Why are piercing points important to transform boundaries?
Why are piercing points important to transform boundaries? They track fault movements. What famous transform fault is known for being the boundary between the Pacific Plate and North American Plate in California?
Q. Why do continents generally not Subduct?
What makes continental plates different than oceanic plates? Why do continents generally not subduct? Continents are too low in density to subduct. What features are associated with subduction?
