Signs of an Eruption
Many volcanoes give off warnings before they erupt.  Most volcanic eruptions where the volcano explodes there are usulally no warnings or signs before it explodes.  Warnings or sings may include earth quakes, changes in the tempature, and streams may change in tempature and chimical makeup. Steam may began to flow out of the top of the volcano before an eruption.  Since scientist can detect a volcano eruption before it happens a near by town or city can be evacuated.