Mateo is a geologist working at NASA's Jet Propulsion Laboratory at Caltech. He is currently observing a major volcanic eruption on Jupiter's uninhabited moon lo. What kind of natural event is he observing? Choose the best answer below. (Side note: Although the person and situation above is fictitious, read about a real geologist working with JPL in simimlar research: https://science.jpl.nasa.gov/people/pappalardo/) Select one: Oa. Natural Hazard Ob. Natural Disaster Natural Castastrophe O d. None of these

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