Crack in rock

If I could live my life over again, I would not be a geologist. But if I could have 10 or 20 lives, one of them would be as a geologist. I've always loved rocks. I cracked them open with a hammer as a child, collected them (still have a rock display on my window sill at work), read about them, and wondered, "Now how did that rock get that way? Where did it come from? How was it formed?" If I were a geologist, I'd have more answers, and probably more questions, too.