Answer:
Tectonic plates are large, motile plates of irregular shape, of which the Earth's crust is made. The surface of the plate can be entirely made up of the seafloor (as the Nazca plate) or it can consist of both the continent and the ocean (as the Eurasian plate). Some small plates are completely continental, but all large plates also contain seafloor.
The plates move as a whole resulting in the appearance that the interior of the plate is relatively tectonically passive. Volcanoes, earthquakes and young mountain ranges are located in narrow areas at plate boundaries.
