What source of internal heat does the Moon rely on for any residual activity, contrasting with Io's primary source?
Answer
Radioactive decay
The Moon relies on slower, finite radioactive decay for residual internal heat, whereas Io's tidal flexing provides an almost inexhaustible supply of energy.

Related Questions
Which body is known as the most volcanically active in the entire solar system?What is the primary mechanism driving the relentless eruptions on Io?Io maintains its orbital resonance and intense heating primarily due to which two other Galilean moons?What chemicals are the primary eruptive materials that give Io its characteristic multicolored surface?How frequently is Io's surface material estimated to be completely recycled?What temperature, measured in Kelvin, have some of Io's lava flows approached, indicating extremely hot magma?How long is Io estimated to have sustained this period of intense volcanic activity?In stark contrast to Io, what is the current geological state of our Moon?What source of internal heat does the Moon rely on for any residual activity, contrasting with Io's primary source?What feature on Io can shoot eruption material hundreds of kilometers high into space?