Yes. The surface of earth covered by the oceans are part of the plates of the earth.
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Originally it was thought that the earth's lithosphere (crust) was made of individual plates that are broken down into over a dozen large and small pieces of rock. These fragmented plates collided with, slid under or moved past adjacent plates. This is what shaped the earth's landscape.
The reason this occurs is because of subduction. The heat of the plates rubbing causes magma to rise forcing through the lithosphere (or crust). Thus causing alot of volcanos over convergent plates.
The solid layer of the earth that can still flow is called the asthenosphere. This layer is located in the mantle of the earth the layer below the upper crust and lithosphere, home of the tectonic plates.
magma.
the earth's crust