Question 5
State two classes of rocks based on the way they were formed and give an example in each case.
This is a popular question among the candidates and the performance was good. The question requested the candidates to give the following points:
Classes of rocks based on the way they are formed
- Igneous rock e.g. granite, diorite, gabbro, pegmatite
- Sedimentary rock e.g. limestone, dolomite, evaporates, coal, sandstone, siltstone, shale.
- Metamorphic rock e.g. marble, garnet, kyanite, chlorite, talc, graphite, tourmaline, asbestos, mica, slate, serpentine, pyrite, galena, quartzite, gneiss, schist.