Subduction
Subduction is where two tectonic plates collide. One plate slides under the other to form a trench, sometimes the plates form a mountain. Where this happens, it is called a subduction zone. There are 3 types of subduction. The 3 types of subduction are; ocean to continent, ocean to ocean and continent to continent. Subduction dose not happen smoothly it usually happens in jerks creating seismic waves. These seismic waves result in earthquakes. As the plates scrape together the rocks break creating a fault line. This is the same for all types of subduction.
The results for each type of Subduction are different. When ocean and continent plates subduct the result is a line of volcanoes made from the oceans crust. This also causes an ocean trench. Ocean to ocean subduction cause island arc volcanos and again a sea trench. This newly created part of the sea is the deepest part of ocean. Magma that is made from the tectonic plates of the ocean crust seeps out of the crack created by subduction. When the magma rises it cools forming an island arc volcano chain. These Subduction volcanoes are more dangerous than normal Volcanos. This is because of the presence of the water and the by-product of the crust subducting. This by-product is different types of gas. This creates pressure forcing the magma up more fiercely. The final type of subduction is continent to continent. This results in one plate subducting. While the continental crust smashes together forming a mountain range like the Himalayas or the Andes.