Limestone has been the rock of choice and the focus has been on ensuring that you all understand exactly what it is made of and the impact that all of that nasty acid rain has on it.
Wikipedia is a great place to start http://en.wikipedia.org/wiki/Limestone and has lots of the more general information on Karst scenery and formations. This video is a bit cheesy but it does show GCSE students getting to grips with and explaining Limestone features at Malham Cove which was our main case study and the area which we have covered especially in relation to mapwork interpretation of geological features.
Limestone Pavements accompanied by a photograph or diagram are a popular topic for short questions at IGCSE so it is a very good idea to familiarise yourself with the hows and whys about their formation and the type of upland landscape that they create. Just remember that not all geographers are like this presenter!
