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...little pieces of other rocks, stuck together with some kind of cement. Your igneous and metamorphic rocks will have the grains actually interlocking. And your metamorphic rocks might have some kind of alignment, but you'll often have to step back to see it. Good luck, and happy hunting! Like geology? Find out more with these FREE resources Study geo-sciences with the OU...

...free to use. And there’s a lot of talk about this and there are various initiatives. It’s a difficult one for the BBC, because embodied in our whole existence and our charter is not to campaign and we have to be careful… Well, it’s a question, when I say we have to be careful, it’s a question to ask, saying if we put lots of rushes and ins and outs and things...