That is the point. It has been answered so many times that many of us are tired of seeing it asked over and over again. We have all explained it to you the best that we can. Honestly, the story team never gave us an official description of why the elements are different, so we've had to come to some general agreements on what makes the most sense about it. One more time: Stone--sedimentary, igneous, or metamorphic material that is super-dense, solid, and dry. Earth--loose, grainy, moist material including soil, clay, and mud. Plants grow and thrive in this stuff. That is the difference. Have we answered your question? So now you're giving me non-cannon information? Don't waste my time.