what are the harmful and the beneficial effects of a volcanic eruption?

Answer:
Major health threats from a volcanic eruption
Health concerns after a volcanic eruption include infectious disease, respiratory illness, burns, injuries from falls, and vehicle accidents related to the slippery, hazy conditions caused by ash.
6 ways volcanoes benefit Earth, our environment
Atmospheric cooling. ...
Land formation. ...
Water production. ...
Fertile land. ...
Geothermal energy. ...
Raw materials.