Which type of rock is it?

Does anyone know what we call people who study rocks? Petrologists! So today, children in year three became a petrologist! (Petrologists study rocks while Geologists study the science of the Earth and its rocks). Children were put into groups to experiment. They had an acid test, (with vinegar) to see whether or not the rock ‘fizzed’.  A water test to decide if the rocks were permeable (allowed water in) and a hardness test to see if they let off sediments (small particles). The results helped us decide as to whether the rocks were igneous, sedimentary or metamorphic. Ask your children how rocks are made!