The oceanic crust is made up of basalt while continental crust is made up of mostly granite.
The material they are made of.
Two differences are that the oceanic crust is more dense than continental, and continental crust is composed mostly of granite, while oceanic is mostly basalt
Oceanic crust is denser than continental crust because it is made up of denser rock types, such as basalt, and it is also thinner and younger. Continental crust is less dense because it is composed of lighter rock types, such as granite, and is thicker and older due to the accumulation of layers over time.
Convergence can occur between oceanic-oceanic, oceanic-continental, and continental-continental plates. This process typically leads to the formation of mountain ranges, deep ocean trenches, and volcanic arcs.
Oceanic crust is mostly basaltic, which is denser, while continental crust is made from mostly basaltic and sedimentary rocks, which are less dense. This difference in density is why the oceanic crust sinks lower (thus the oceans) and the continental crust rides higher (thus the continents) on the mantle.
Continental crust is thicker and less dense while oceanic crust is thinner and more dense, so essentially continental crust takes a higher position than oceanic crust. When oceanic and continental plates collide, oceanic plates slide underneath continental plates(if this makes what I said any clearer).
Oceanic crust is mostly basaltic, which is denser, while continental crust is made from mostly basaltic and sedimentary rocks, which are less dense. This difference in density is why the oceanic crust sinks lower (thus the oceans) and the continental crust rides higher (thus the continents) on the mantle.
Most significantly, there is a material difference in the weight and density of the two types of crust. This manifests itself when tectonic movement brings oceanic in continental plates into collision. Oceanic crust is relatively denser but typically about 100km this. Continental crust is lighter but almost twice as thick--about 200km.
Oceanic-Oceanic.
Oceanic plates are heavier than continental plates because they are denser and thinner. Continental plates are lighter because they are less dense and thicker. The difference in density and composition accounts for the varying weights of the Earth's plates.
In technical terms, the oceanic crust is denser than the continental crust so when the continental crust and the oceanic crust meet the continental crust will sink under and the oceanic crust will slide over and a volcano will be formed as well as producing earthquakes in the process.
The boundary between the oceanic crust and continental crust is known as the continental shelf. This is the shallowest part of the ocean that extends from the shore to the continental slope.