The only tectonic plates that include only oceanic crust with no continents are the Pacific Plate and the Cocos Plate.

Here's why:

* Pacific Plate: The largest tectonic plate on Earth, it's almost entirely oceanic, with only a few small islands scattered across it.

* Cocos Plate: Located off the coast of Central America, this smaller plate is also entirely oceanic.

While other plates like the Nazca Plate and the Philippine Sea Plate are predominantly oceanic, they do have small continental fragments associated with them.