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
The oceanic crust is made up of basalt while continental crust is made up of mostly granite.
One major difference between oceanic crust and continental crust is their composition and density. Oceanic crust is primarily composed of basalt and is denser and thinner, averaging about 7 kilometers in thickness. In contrast, continental crust is mainly composed of lighter granitic rocks and is thicker, averaging around 30-50 kilometers. This difference in density contributes to the distinct characteristics of oceanic and continental tectonic plates.
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.
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.
Continental crust is thicker but less dense, and oceanic crust is thinner but more dense, making it heavier.