4 clues

Clues to a volcanic eruption

some clues consist of :

• seismic disturbances
• the amount of sulfur dioxide emmisions increase
• slight swelling in the volcano's slope
• if there was a recent eruption the seismic activity might set off a near by volcano

if you are in the vacinity of a volcano and you experience some of there signs it would be wise to evacuate the area immediatley.