What happens when oceanic crust hits continental crust?
When oceanic crust converges with continental crust, the denser oceanic plate plunges beneath the continental plate. This process, called subduction, occurs at the oceanic trenches (figure 6). The entire region is known as a subduction zone. Subduction zones have a lot of intense earthquakes and volcanic eruptions.
What happends when two plates of the same density collide?
Formation convergent boundaries. A tectonic plate boundary always forms when two continental plates collide. Neither plate subducts because the crust have approximately the same density. Instead, the rocks are smashed together causing them to recrystallize due to the intense heat and pressure from the colliding plates.
What happens when two oceanic plates converge/meet?
When two oceanic plates collide, their densities help to determine the one that will appear on top of the other. And as you already know, the oceanic crust does become denser and colder when it spreads out of the mid-ocean ridge. So, when two oceanic plates conveying oceanic crust collides at a trench, the denser one will come under the less dense plate . That is what happens when oceanic plates meet.
What happens when an oceanic plate hits a continental plate?
Generally, when the oceanic plate hits a continental one, the continental plate uplifts, and the oceanic plate goes beneath it or subducts. When two oceanic plates collide, the older, heavier plate usually subducts beneath the other.
What is formed when one oceanic plate moves under another?
An island arc results when one oceanic plate moves under another oceanic plate. A continental arc results when an oceanic plate moves under a continental plate. Volcanoes and volcanic activity often occur as a result of the subduction process because the subducting slab releases liquids as it moves into the extreme temperatures of the mantle layer.