What happens at a destructive plate boundary and why?

Answer 1

A destructive plate boundary is where a continental plate meets an oceanic plate. The oceanic plate descends under the continental plate because it is denser. As the oceanic plate it starts to subduct (melt) due to friction caused by the movement. Then, the melted plate turns to magma and the volcano is formed.

A destructive plate boundary may also be formed between Oceanic plates and Continental plates. Japan is an example of two oceanic plates colliding against each other and an example of two continental plates colliding is the collision of the Indian and Eurasian plate.

Answer 2

First, one slides under the other and starts to melt when the submerging crust reaches its melting point(the temperature at which the minerals/types of rocks/etc that make up the crust start to melt at); but they melt sooner & at lower temperatures/lower pressures/etc when there's water in the crust. It also melts because of the heavy tectonic plate/bodies of water/etc above it; even though pressure & immense weight tries to fight against the heating up & melting of crust, super hot magma(lava below the surface of the crust) in the Earth's interior, etc(since heating up an object, gas, liquid, etc usually means that it's going to expand,or try to at least). That melted magma melts part of the plate above it and can rise upward. It usually creates a magma chamber that can then erupt as a volcano. Sometimes it hardens before reaching the surface and becomes a dike(magma punching up through crustal layers perpendicular to the layer) or sill(lava melting upward through the crust & then moving outwards horizontally in between crustal layers). That's another story, though. Second, colliding tectonic plates rarely get stuck without either one going sideways(?) or one going under the other, but for all we know it could have happened at some point in the Earth's past or an alien world's past. Two plates stuck in place pressing evenly & directly against one another. I don't know what happens after that. Third, sometimes when tectonic plates goes under another one, it can get stuck. It stays there for a certain amount of time; depending on its composition, properties, the direction it's going, how strong the crust is, the crust's history, the status of the crust above it, etc. It continues being pushed under & against the overlying rock. As it does; it starts to get stressed/etc. Plus, the power/energy/etc within the crust starts to build & it keeps building until something gives. Eventually, one of the plates can't hold its ever-growing amount of energy and it suddenly slips into a new nearby(?) position. The energy that's suddenly released is like a a bull whip(?) being whipped. This energy causes the earthquakes that we know so well. The longer crust remains stuck, the strong the earthquake is going to be.

Answer 3

One of the convergent plates will be subducted and destroyed at a convergent boundary. In other words, one of the plates will slide beneath the other plate. Then it will melt and become magma, which destroys that part of the plate. As the plates continue to converge, that plate will continue to slide under the other plate and, little by little, it will be destroyed.

Of course, on that melting plate, (at its divergent boundary), new plate is being created so it is growing on one side and melting on the other side. So, in the long run, the plate isn't so much destroyed as it is recycled.

Answer 4

Convergent boundaries are called destructive boundaries because they do not create new crust.