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2 types of crust involved at constructive plate margins?
Two types of crust involved at constructive plate margins are oceanic and continental crust. Oceanic crust is formed when magma rises to the surface at mid-ocean ridges, creating new oceanic crust. Continental crust can also be involved at constructive plate margins when rifting occurs, leading to the formation of new continental crust.
Do earthquakes occur at constructive margins?
Yes, earthquakes can occur at constructive margins where tectonic plates are moving apart. As the plates separate, tension builds up in the crust which can lead to faults slipping and causing earthquakes. However, earthquakes at constructive margins tend to be less frequent and less intense compared to those at other types of plate boundaries.
Why do volcanoes occur at constructive plate margins and subduction zones?
Because the subducting plate is water saturated oceanic crust, and as it moves down into the mantle it vaporizes the water and forces steam upwards. At the same time, the descending plate causes friction and circulation, leading to pressure-release melting. All of these processes melt the upper mantle to form magma chambers and thus, volcanoes.
When does a plate carrying continental crust converges with a plate carrying oceanic crust?
When a plate carrying continental crust converges with a plate carrying oceanic crust, the denser oceanic plate is typically subducted beneath the less dense continental plate. This can lead to the formation of volcanic arcs and deep ocean trenches.
Is oceanic crust slide under oceanic crust during subduction?
Yes, oceanic crust can slide under oceanic crust during subduction at convergent plate boundaries. This process occurs when a more dense oceanic plate descends beneath another oceanic plate, leading to the formation of a subduction zone.
2 types of crust involved at constructive plate margins?
Two types of crust involved at constructive plate margins are oceanic and continental crust. Oceanic crust is formed when magma rises to the surface at mid-ocean ridges, creating new oceanic crust. Continental crust can also be involved at constructive plate margins when rifting occurs, leading to the formation of new continental crust.
What is the difference between constructive and destructive plate margins?
a constructive (divergent) plate boundary, new crust is being created to infill the gaps caused by spreading plates. At a destructive (subduction-convergent) plate boundary, old, dense oceanic crust is diving into, and becoming part of the mantle.Read more: What_is_the_difference_between_a_constructive_plate_boundary_and_a_destructive_plate_boundary
Why does the oceanic crust move below continental crust?
The basaltic oceanic crust is more dense than the granitic continental crust. Therefore, when the two meet at plate margins, the oceanic crust usually subducts beneath the continental plate.
What type plate margin are ocean trenches associated with?
Convergent plate margins where oceanic crust is being subducted under continental crust.
Do earthquakes occur at constructive margins?
Yes, earthquakes can occur at constructive margins where tectonic plates are moving apart. As the plates separate, tension builds up in the crust which can lead to faults slipping and causing earthquakes. However, earthquakes at constructive margins tend to be less frequent and less intense compared to those at other types of plate boundaries.
What is oceanic-oceanic subduction?
Oceanic crust sinking under a plate with continental crust
Why do volcanoes occur at constructive plate margins and subduction zones?
Because the subducting plate is water saturated oceanic crust, and as it moves down into the mantle it vaporizes the water and forces steam upwards. At the same time, the descending plate causes friction and circulation, leading to pressure-release melting. All of these processes melt the upper mantle to form magma chambers and thus, volcanoes.
What happens when an oceanic plate collides with a continental plate?
when oceanic crust and continental crust collide, the oceanic crust sinks down beneath the continental crust. this is called subduction.
What happens when a plate of oceanic crust collides with a plate of oceanic crust?
The oceanic plate is made of denser (and thinner) rock than the continental crust, so the oceanic plate gets subducted (pushed underneath) where it descends and gets melted by geothermal heat.
How are convergent plate margins characterized?
Convergent plate margins are characterized as collision zones between plates and may involve continental to continental crust, continental to oceanic crust, or oceanic to oceanic crust. Those that involve oceanic crust result in subduction of the more dense plate into the Earth's mantle. Continental to continental plate collisions result in uplift of the surface features and mountain building and the margin may eventually become welded together.
What happens when a plate of oceanic crust collides with a plate of Continetal crust why?
the oceanic crust slides down and burns in the mantle and forms a volcano
Why is oceanic crust usually much younger than continental crust?
Crust is produced at constructive plate boundaries, usually at mid ocean ridges. Here the plates are moving apart and magma wells up to form new basaltic rock. This means the youngest crust is usually part of an oceanic plate. When an oceanic plate collides with a continental plate, the denser oceanic plate sinks down in a subduction zone and ends up as magma again. The less dense continental crust is forced upwards and is preserved. Continental rocks are thus often very old.
