In the world of dreams the rules of reality do not necessarily apply. Each dream is unique and it's a direct link to the soul and spirit. Psychology provides its own theories on what dreams mean, but so did tradition and the study of dreams for thousands of years before any relevant science had developed.
Dream Meanings - Volcano
If you dream of a volcano then you will have an outburst of the nerves, anger and bitterness hidden inside of you and will argue with someone who has wronged you.