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A tag is a keyword or label that categorizes your question with other, similar questions. Using the right tags makes it easier for others to find and answer your question.

applied to improve the output of models used for numerical weather prediction.
Questions relating to hydrofluoric acid, for example its generation in nature or its use in lab contexts such as rock digestion.
Volcanic Smog formed from volcanogenic SO2 and dust particles.
Volcanic Explosivity Index, a comparative measurement of volcanic eruptions based on the amount of ejecta and other observations (if possible).