Different Types of Weathering Practical Circus

You will need to set up five stations, (or two or three sets of five if you have a large class). We place all the equipment for each 'activity' in a tray with a laminated section of worksheet so pupils are clear which station they are at.
The pupils will need about five minutes at each station plus 30s or so tidy up and move round time. Get them to fill in their worksheets as they go round.
Station one
Have a Bunsen and heat proof mat set up, with tongs, a beaker of cold water, old glass rods and goggles at the ready. You will want to go through the safety aspects of this activity before you start the whole circus and will probably want to hover near this area for much of the lesson!
Station Two
Fill several glass bottles to the top with water, screw on a lid and leave in the freezer until just before the lesson. We do extras as sometimes the results are more spectacular than others! We also place a very clear 'DO NOT TOUCH' sign in the tray.
Station Three
Put a selection or rocks into a tray, make sure to include some which do react with acid, such as marble and limestone. Have dil. HCl and goggles ready.
Station Four
Have copies of the information and pictures about Caribou ready for pulls to examine. We make up laminated copies in advance.
Station Five
Similar deal to station four, just with the plant pictures instead.