How much strain does a soil sustain from the growth of tree roots? Assume that the tree roots are 10 cm in diameter, are simple vertical taproots, and are spaced at 1.5 m spacing. (Obviously this is a very simple model of roots!)

How much ought the soil to inflate vertically due merely to this taproot growth if the soil is 1 m thick? Do the experiment in a small beaker to illustrate this effect.