http://www.rps.psu.edu/jan2000/volcano.html
The soil is fertile, and a lot of volcanic products can be used in everyday life. Sulphur, for example, can be used as an ingredient in matches, or in medicine, while the finer volcanic deposits, such as the gravels and sands found in rivers, can be used in building materials. In addition, the thermal energy from some volcanoes can be used to generate electric power.
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