2 ms·The rock is a pretty thin sheen as well, if you want to look at it that way.by gnaritas 15y agoThe rock is a pretty thin sheen as well, if you want to look at it that way.planetguy 15y agoWell, no, it's rock most of the way down. There's a common misconception, incidentally, that the mantle is liquid.gnaritas 15y agoSo it is; I stand corrected, and learned something.