* They are both part of the Earth's lithosphere: The lithosphere is the rigid outermost layer of Earth, composed of the crust and the uppermost part of the mantle. Both oceanic and continental crust contribute to this rigid layer.
* They are both composed of rock: Both types of crust are made up of various types of rock, although their specific compositions differ.
* They both sit on the asthenosphere: The asthenosphere is a semi-molten layer in the Earth's upper mantle. Both oceanic and continental crust "float" on this partially melted layer.
* They both play a role in plate tectonics: Both oceanic and continental crust are involved in the movement of Earth's tectonic plates.
Let me know if you'd like more information about any of these commonalities or about the differences between oceanic and continental crust.
