Tectonic plates
A lithosphere block that consist of the crust and rigid, outermost part of the mantle. Think of the lithosphere as a giant jigsaw puzzle. All the tectonic plates have names, some of which you already know. (look at picture below)
(Holt Science & Technology: Earth Science pg.194)
Thick tectonic plates, such as those made of continental crust, displace more asthenosphere than do thin plates, such as those made of oceanic lithosphere. Each tectonic plate fits together with the tectonic plates that surround it. The lithosphere is like a jigsaw puzzle, and the tectonic plates are like the pieces of a jigsaw puzzle. Not all the tectonic plates are the same. For example, compare the size of the South American plate with the Cocos plate. The South American plate has an entire continent on it and has oceanic crust, but the Cocos plate has only oceanic crust. Some tectonic plates, such as the South american plate, include both continental and oceanic crust.