The argument of the contribution of life to sedimentation interests me: How much faster would you suspect sedimentation to proceed due to the existence of life? In other words, how fast would sedimentation proceed on a lifeless earth if there was "just" the effects of freezing water that cracks rocks, or the transportation of rocks by water and the resulting collision of rocks resulting in breaking down of more material etc. Plus, even without life there is wind that moves sand that reduces rocks to more sand. As I formulate the question, of course I realize how very impossible the idea is of Earth without life but with the same amount of water and the same atmosphere and with the same weather. Still: is there any way to tell the relative contribution of life to sedimentation versus that of the other forces causing sedimentation?