The Theory of Plate Tectonics

Plate Tectonics is the geological theory that states that pieces of Earth’s lithosphere are in constant, slow motion, driven by convection currents in the mantle.

The theory of plate tectonics explains the formation, movement, and subduction of Earth’s plates.

            The plates fit closely together along cracks in the crust.

            They float on top of the asthenosphere.

            They carry the continents, parts of the ocean floor, or both.


The edges of the different plates meet at lines called plate boundaries.

A transform boundary is a place where two plates slip past each other, moving in the opposite direction.

A divergent boundary is where two plates are moving apart, or diverge.

A convergent boundary is where two plates come together, or collide.