Concept: A geyser is a natural spring that erupts hot water and steam in a fountain-like jet.Explanation: Geysers occur in geothermal areas where underground water is heated under pressure. When the pressure builds enough, the water and steam burst out through the surface in an intermittent fountain. This makes a geyser different from a volcano, a normal thermal stream, or a calm pool of hot water.Answer: Option B — fountain of super heated stream.