How does subduction produce magma?
At the point where two plates collide, one plate may be pushed under the other plate, so that it sinks into the mantle. … The increased water content lowers the melting point of the mantle rock in this wedge, causing it to melt into magma. This sort of magma production is called subduction zone volcanism.
What makes volcanoes more explosive?
When magma is rapidly expelled from a volcano, it undergoes rapid cooling. … This induces the formation of crystals, resulting in a sudden increase in the viscosity of the magma. In turn, this produces magma fragmentation, creating a highly explosive eruption.
What causes the subduction of one of the oceanic plates?
When an oceanic and a continental plate collide, eventually the oceanic plate is subducted under the continental plate due to the high density of the oceanic plate. Once again a benioff zone forms where there are shallow intermediate and deep focus earthquakes.
What is subduction and uplift?
The idea is that series of severe earthquakes within a geologically short period of time cause the rising of the land where one tectonic plate slips beneath another slab of Earth’s crust in a process called subduction. …
Which statement best explains the process of subduction?
Answer: The geological process taking place in the convergent boundaries is what is called subduction. Explanation: The tectonic plates moves from side to another and they are forced to sink because of substantial gravitational forces to the mantle.
How do volcanoes formed along the subduction zone differ from hotspot volcanoes?
Most hotspot volcanoes are basaltic (e.g., Hawaii, Tahiti). As a result, they are less explosive than subduction zone volcanoes, in which water is trapped under the overriding plate. Where hotspots occur in continental regions, basaltic magma rises through the continental crust, which melts to form rhyolites.
Why does intraplate volcanism occur?
Stratovolcanoes tend to form at subduction zones, or convergent plate margins, where an oceanic plate slides beneath a continental plate and contributes to the rise of magma to the surface.
How the convection current affects the movement of tectonic plates?
Convection currents describe the rising, spread, and sinking of gas, liquid, or molten material caused by the application of heat. … Tremendous heat and pressure within the earth cause the hot magma to flow in convection currents. These currents cause the movement of the tectonic plates that make up the earth’s crust.
What depths of earthquakes does a subducting plate produce?
Subduction Zones. Along convergent plate margins with subduction zones, earthquakes range from shallow to depths of up to 700 km. Earthquakes occur where the two plates are in contact, as well as in zones of deformation on the overriding plate, and along the subducting slab deeper within the mantle.
What type of tectonic plate movement causes volcanoes?
The two types of plate boundaries that are most likely to produce volcanic activity are divergent plate boundaries and convergent plate boundaries. At a divergent boundary, tectonic plates move apart from one another.
How does subduction produce magma quizlet?
Magma is produced in subduction zones by melting of the oceanic crust of the subducting plate. The depth at which melting takes place in subduction zones is about: More crystal fractionation and significant crustal contamination.
Why do you usually find volcanoes near subduction zones?
At a subduction zone an oceanic crust is pushed under the continental crust. As the oceanic crust is pushed under the continental crust it is subjected to heat and pressure. The heat and pressure causes the crust to melt and become magma. … When the magma reaches the surface it creates a volcano.
How does a subduction zone earthquake displace water?
The earthquake lifts or lowers the seabed. A tsunami can be generated when the earthquake causes a sudden vertical deformation of the seafloor, thus displacing the overlying water from its equilibrium position. … Subduction zone related earthquakes are particularly effective in generating tsunamis.Subduction, stratovolcano’s and explosive eruptions at convergent plate boundaries
Volcanic eruption explained – Steven Anderson
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