The quality or state of being eruptive; the tendency or capacity to erupt suddenly and forcefully.
Derived from eruptive plus the suffix -ness, which forms abstract nouns indicating a state or quality. This suffix allows adjectives to become nouns describing their essential characteristics.
The eruptiveness of a volcano determines how dangerous it is—Mount Vesuvius's eruptiveness was catastrophically high, while some Hawaiian volcanoes erupt in slow, predictable flows, showing low eruptiveness.
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