What was the theory profounded by Alfred Wegener, a German meteorologist? With what principle was it associated?

Explanation

It emphasised that the earth is divided into plates and these plates have been constantly moving over the globe throughout the history of the earth. It is not the continent that moves as believed by Wegener. Continents are part of a plate and what moves is the plate. All the plates, without exception, have moved in the geological past, and shall continue to move in the future as well.