Question

How can tectonic plates move relative to each other ?

Answer 1

I know that I'm late but, the correct answer is:

The Earth's outer crust (the lithosphere) is composed of a series of tectonic plates that move on a hot flowing mantle layer called the asthenosphere. Heat within the asthenosphere creates convection currents that cause tectonic plates to move several centimeters per year relative to each other.