Explore the fascinating world of Jupiter's moon Io in this 21-minute video lecture. Delve into the mystery of Io's intense volcanic activity and the potential existence of a magma ocean within its interior. Learn about the composition of Io's surface lava and how it provides insights into the moon's internal structure. Discover various hypotheses regarding Io's mantle composition and the role of tidal heating in maintaining its volcanic activity. Examine the relationship between magma viscosity, silica content, and eruption styles on Io. Gain an understanding of partial melting processes and their implications for Io's geology. Investigate the formation of Io within the context of solar system evolution. Conclude with a discussion on current knowledge gaps and future research directions regarding this intriguing Jovian moon.