After examining its first sample of Martian soil, Curiosity's scientists have noticed that the soil strongly resembles the soil on Hawaii. They've said it was basaltic like the ground near volcanos in Hawaii.
Curiosity also analysed the soil further by shooting X-rays at it. This is a technique well known back here on Earth that allows scientists to learn the chemical make up of a sample by the light it emits.
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BBC News: http://www.bbc.co.uk/news/science-environment-2015178
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