The quality, state, or degree of being eruptive; the capacity for or tendency toward eruption.
Formed from eruptive with the suffix -ity, which creates abstract nouns from adjectives. This follows the pattern of Latin abstract noun formation (e.g., captivity from captive).
Volcanologists measure 'eruptivity' on scales like the Volcanic Explosivity Index to predict how dangerous a volcano will be—higher eruptivity means more explosive power and greater risk to nearby populations.
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