This is one of the things I keep wondering about lately: can Terra control earth with her mind or can she only control it using her hands, feet, and other body parts like the earthbenders in "Avatar: The Last Airbender" and "The Legend of Korra" (which happen to be favorite cartoons of mine as well)?
And for all those "Teen Titans" fans out there who love "Avatar: The Last Airbender" too, who do you think would win in an earthbending battle: Terra or Toph? I think either can win because Toph, though blind, can use seismic sense to predict Terra's next move and she can metalbend as well as sandbend but Terra can throw rocks which have been in the air (using her powers) for some time while flying by riding a boulder so Toph can't sense where she is and where the rocks/projectiles are coming from.
~Andreana02