wrecks are for the most part known locations of ships, planes, barges, and other man-made items that for one reason or another ended up on the bottom of the sea. and it's a little dirtier than i thought. if a student has the incorrect footwear on they will be sent home to get the correct shoes. for example: when a metal spoon is put inside a cup of hot chocolate, heat travels from the hot chocolate to the spoon because the two are touching and because metal is an excellent conductor of heat. 