Beneficial effects: *Makes a new landform.. *Makes the soil fertile. *The nutrients and minerals needed by plants is released during an eruption. Harmful effects: *Loose of lives.. Destroys properties and crops... *Distraction of environment.... Hope I help you:)

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Postive effect - produced very rich soil. negative effect- flow of lava that may influenced the society, and decrease of earth's surface temperature as a result of measurable cooling of earth surface for a period.