HELP!!!!!! Homework Crisis!?

I have to write a 4 page essay on supersaturation and i have no idea what to write so far I have 1 page 2.5 spaces and 14 font, call me an MLA cheater lol! But SERIOUSLY I cant think of ANYTHING to write! Oh and I have to have 4 References and 1 is my text book! But there is NOTHING on supersaturation! HELP please!