The study of soils - how much more interesting can you get. My favorite is the brown earth profile - what's yours? Rumour has it that Miss Irvine and Miss Macleod love a podsol!!!
Check out the posters on the Macauly Institute website - get them on your wall now!
Another good website for revisions is this:
http://www.schoolportal.co.uk/GroupRenderCustomPage.asp?GroupID=12426&ResourceId=96848 This website has some great animations to help you understand soils.