Do plates move in a series of quick, huge movements or at a slow, steady rate?

The Earth's plates are in constant, but very, very slow motion.

Explanation:

if you mean plate tectonics then they move at a slow, steady pace.

Explanation:

did you know plate tectonics plate tectonics move real slow. theres convection in the mantle and it makes them go, hot magma rises up above and cool rock sinks below, it causes plate tectonics plate tectonics, here we go yeah its a song that has been stuck in my head since that class