How do Plate Tectonics Work?

Plate tectonics is the movement of the earth’s plates. The plates slide against each other, move apart, or smash together. When the plates slide against each other, it causes fault lines, which are breaks in the earth’s crust. Earthquakes are a common occurrence on the fault lines. Plates moving apart causes hot, molten rock (lava) to flow upwards. Mountains are formed when the plates push together.