Oceanic crust is more dense which makes it subduct and continental crust is less dense which makes it override the oceanic crust during subduction
The type of plate boundary is divergent/constructive plate boundary.
Divergent plate boundary, also known as constructive plate boundary is where the plates move apart under the rising convection current of magma.
As plates move apart, cracks are formed and the upwelling magma from mantle would fill the cracks. Once the lava cools down, new plate material is created to create new seafloor. This is also called seafloor spreading.
Therefore, the answer is divergent/constructive plate boundary.
Hope it helps!
The answer is Cyclical unemployment.
Air movement is the science term that contains all of those letters.
