Continental-continental collision
A boundary along which two tectonic plates carrying continental crust push together
Oceanic-oceanic subduction
A boundary along which a tectonic plate carrying oceanic crust sinks beneath another plate with oceanic crust
Oceanic-continental subduction
A boundary along which a tectonic plate carrying oceanic crust sinks beneath another plate with continental crust
Subduction:
The process by which an oceanic tectonic plate sinks under another plate into Earth’s mantle