erupting volcanoes can pose many hazards, not only in the immediate vicinity of the eruption.
volcanic ash can be a threat to aircraft, in particular those with jet engines where ash particles can be melted by the high operating temperature; the melted particles
then adhere to the turbine blades and alter their shape, disrupting the operation of the turbine.
large eruptions can affect temperature as ash and droplets of sulfuric acid heat the sun and cool the Earth's lower atmosphere or troposphere; however,they also absorb heat radiated up from the Earth, thereby warming the catastrophic Historically, so-called volcanic winters have caused catastrophic famines.