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What causes magma to rise at the subduction zone?

As a tectonic plate slides into the mantle, the hotter layer beneath Earth’s crust, the heating releases fluids trapped in the plate. These fluids, such as seawater and carbon dioxide, rise into the upper plate and can partially melt the overlying crust, forming magma.

How do subduction and sea floor work together?

The two processes of seafloor spreading and subduction work together to constantly recycle and renew the earth’s crust. While new earth is being “born” at mid-ocean ridges by seafloor spreading, in other areas earth is being “destroyed” at deep-ocean trenches by subduction.

Does subduction create magma?

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.

What does an oceanic-continental convergence give rise to?

Explanation; Oceanic-oceanic convergence occurs when an oceanic plate subducts another oceanic plate resulting to the formation of volcanic islands and trenches. Volcanic arcs are volcanoes that are in the shape of an arc formed above a subducting plate.

Which forms volcanic island arc?

Offshore volcanoes form islands, resulting in a volcanic island arc. Generally, volcanic arcs result from the subduction of an oceanic tectonic plate under another tectonic plate, and often parallel an oceanic trench. Here the mantle melts and forms magma at depth under the overriding plate.

What is the major difference between oceanic-continental convergence and oceanic-oceanic convergence?

Continental plates are much thicker that Oceanic plates. At the convergent boundaries the continental plates are pushed upward and gain thickness. The rocks and geological layers are much older on continental plates than in the oceanic plates. The Continental plates are much less dense than the Oceanic plates.

What is formed in the convergence of two oceanic and continental plates?

Ocean-Continent Convergence This occurs at an ocean trench (Figure below). Subduction zones are where subduction takes place. Subduction of an oceanic plate beneath a continental plate forms a line of volcanoes known as a continental arc and causes earthquakes.

What is formed in the convergence of two oceanic oceanic and continental plates?

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. The subducting plate causes melting in the mantle above the plate. The magma rises and erupts, creating volcanoes.