I am tied between Earth and Air. For the reason they are both around us at all times. (Cept in space, but you know what I mean). If I had powers like that I would keep them secret, and only use them when needed. Like if I was at school and saw someone getting picked on or whatever, I would jolt the earth out from under their feet, or blow them off their feet.
Then just to be nerdy as I am, I would then train to do bigger stunts with the element and such.