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

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.

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