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Geologists use the Mohs scale to measure hardness. We think this quiz is most definitely a Mohs 10! Are you up to scratch or will you barely leave a dent?

Finding one meteorite usually requires researchers to walk at least a few million square metres. Seamus Anderson from Curtin University has a way to speed up his meteorite hunts.

This quiz is all about change! Can you get full marks first try, or will you need to change your answers?