Water not only reduces static electricity and therefore reduces mess as you're grinding, but it can also make a major impact on the intensity of the beverage and, potentially, the ability to access higher concentrations of favourable flavours.
During an eruption, magma breaks up into little particles that come out of the volcano in this big plume. Those particles are rubbing against each other and charging up to the point of producing lightning. In a simplistic way, it's similar to grinding coffee, where you're taking these beans and reducing them to fine powder.
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