line_text: Soil. Right.  We have, in front of you here, seven different types of Pennsylvania top soil.  Now, what would you say... is the most important element in the production of above ground leafy growth?  Probably phosphorus, right? [Angela smiles, shakes her head 'no']  Wrong!  It's nitrogen!  Absorb this information.  Good!  Now, let us discuss precipitation.  Stanley!  When rainfall occurs, does it usually fall in a liquid, solid, or gaseous... state?