Question

Select all of the answers that apply.

Which of the following are warning signs that a volcano will soon erupt?

earthquakes or tremors
ground swelling
color changes
smoke plumes

Answer 1

The temperature of rocks in the volcanic cone increase. Changes in shape of the volcanic cone. Most of the time the cone starts to swell or bulge just before a eruption. A number of increases in small earthquakes or tremors around a volcano Emission of gas and steam from a volcano.