An Ocean Trench.
Volcanic arcs and trenches are commonly produced when the oceanic plate bends downwards. For more details, see the following:When an oceanic plate and a continental plate meet at a convergent boundary, the denser oceanic plate is forced down below the less dense continental plate. This is known as subduction.This forms a deep trench on the ocean bed and the subducted crust containing high proportions of volatiles (i.e. water) melts as it sinks. This magma forces it's way to the surface forming volcanoes.Please see the related link for more details.
terranes are attached to the edge of a continent
As the leading edge of an oceanic plate continues to move downward into the mantle at a subduction zone, it will experience increased pressure and temperature. This can lead to the release of water and other volatiles, causing melting in the overlying mantle and potentially generating magma. Over time, this process can contribute to volcanic activity and the formation of volcanic arcs. Additionally, the descending plate may also undergo metamorphism and contribute to complex geological formations.
The edge of the oceanic and continental plates.
As the leading edge of an oceanic plate continues to move downward into the mantle at a subduction zone, it may become increasingly subject to high pressure and temperature conditions. This process can lead to the formation of volcanic arcs and the release of fluids, which can trigger melting and contribute to magma generation. Additionally, the oceanic plate can become deformed and fragmented as it interacts with the overlying continental plate, potentially leading to seismic activity. Over time, the descending plate may eventually be completely consumed in the mantle.
terranes are attached to the edge of a continent
The deepest, darkest area of the ocean that is beyond the edge of the continental shelf.
The edge of the plate will heat up and become part of the molten mantle.
The younger of the two plates, because it is less dense,* will ride over the edge of the older plate.
I believe it was called the downward spiral or something with the word spiral in it
Earthquakes occur along the edge of the oceanic and contiential plates.
There are three types of plate collisions. They are classified by the type of crust involved in the collision. Plate collisions fall into these three types: 1. Both plates have an oceanic leading edge, 2. One plate has a continental leading edge and the other has an oceanic leading edge, and 3. both plates have a continental leading edge