Which of the following statement is correct according to plate tectonics?

1
A tectonic plate is a massive, regularly-shaped slab of solid rock.
2
The theory of plate tectonics proposes that the earth’s lithosphere is divided into seven major and some minor plates.
3
Plates move vertically over the asthenosphere as rigid units. 
4
A tectonic plate is composed of only continental lithosphere.

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