What type of boundary occurs where two plates?
convergent
Why do Convergent boundaries occur?
Convergent (Colliding): This occurs when plates move towards each other and collide. When a continental plate meets an oceanic plate, the thinner, denser, and more flexible oceanic plate sinks beneath the thicker, more rigid continental plate.
What occurs in convergent boundaries?
At convergent plate boundaries, oceanic crust is often forced down into the mantle where it begins to melt. Magma rises into and through the other plate, solidifying into granite, the rock that makes up the continents. Thus, at convergent boundaries, continental crust is created and oceanic crust is destroyed.
What happened with three types of convergent plate boundaries?
Plates may converge directly or at an angle. Three types of convergent boundaries are recognized: continent‐continent, ocean‐continent, and ocean‐ocean. Continent‐continent convergence results when two continents collide. This forms an active continental margin between the subduction zone and the edge of the continent.
Why does magma form at a convergent boundary?
At convergent boundaries magma is formed where water from a subducting plate acts as a flux to lower the melting temperature of the adjacent mantle rock. The higher viscosity prevents gases from escaping from the magma, and so felsic magmas are more pressurized and more likely to erupt explosively.
What type of magma is found at convergent boundaries?
Basaltic magmas
Convergent boundary is formed when plates come towards each other whereas divergent boundary is formed when plates move away from each other.
What’s the difference between subduction zone and convergent boundary?
A subduction zone is where an ocean crust meets a continental crust. The ocean crust is pushed under the continental crust creating a subduction zone and a deep ocean trench. This is a converging boundary. Instead of one plate diving under the other creating a subduction zone, both plates buckle upwards.
Are all convergent plate boundaries subduction zones?
Convergent boundaries are areas where plates move toward each other and collide. These are also known as compressional or destructive boundaries. Subduction zones occur where an oceanic plate meets a continental plate and is pushed underneath it. Subduction zones are marked by oceanic trenches.
What type of stress occurs at a convergent boundary?
Compressive stress
What drives subduction at a convergent plate boundary?
The geologic features related to convergent boundaries vary depending on crust types. Plate tectonics is driven by convection cells in the mantle. Subduction begins when this dense crust converges with less dense crust. The force of gravity helps drive the subducting slab into the mantle.
What are the characteristics of a convergent plate boundary?
A convergent boundary, or destructive boundary, is where two plates are moving towards each other and colliding. The pressure and friction is great enough at these boundaries that the material in the Earth’s mantle can melt, and both earthquakes and volcanoes happen nearby.
What is the process called when one plate is forced beneath another at a convergent plate boundary?
Subduction is a geological process that takes place at convergent boundaries of tectonic plates where one plate moves under another and is forced to sink due to high gravitational potential energy into the mantle. Regions where this process occurs are known as subduction zones.
Which of the following shows a convergent plate boundary?
The Washington-Oregon coastline of the United States is an example of this type of convergent plate boundary. Here the Juan de Fuca oceanic plate is subducting beneath the westward-moving North American continental plate. The Cascade Mountain Range is a line of volcanoes above the melting oceanic plate.
Why are convergent plates called destructive boundary?
A destructive plate boundary is sometimes called a convergent or tensional plate margin. This occurs when oceanic and continental plates move together. Friction causes melting of the oceanic plate and may trigger earthquakes. Magma rises up through cracks and erupts onto the surface.
Effects that are found at a divergent boundary between oceanic plates include: a submarine mountain range such as the Mid-Atlantic Ridge; volcanic activity in the form of fissure eruptions; shallow earthquake activity; creation of new seafloor and a widening ocean basin.
How do convergent plates move?
At convergent boundaries, plates move toward each other. They can push together and cause mountain ranges to form. At other times, one plate gets pushed down beneath the other plate. This can cause volcanoes.
What are the 3 major types of plate movements?
Tectonic Plates and Plate Boundaries
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