Sorting out rocks

Have you tried the ELI 'Rock detective - rocky clues to the past; investigating your local rocks to find out how they were formed'
Collect examples of different types of rock from your local area (and from
further away if you want to) and take your pupils through this investigation sequence - using the clues in the rocks to find out how they formed. Begin with two rocks, one made from sediment, a sedimentary rock, with obvious grains (eg. a sandstone) and the other, a crystalline igneous rock with big crystals (eg. a granite).
The following Rocks Song by Peter Weatherall could be used with this ELI.
 

Click here for the video clip