What primarily causes the structural differentiation observed in Io and Europa, leading to rock/iron cores?

Answer

Tidal heating caused by Jupiter’s immense gravitational field

The heat generated by Jupiter’s gravity acting on the moons melts interior ice layers, allowing denser rock and iron to sink to form a core, a process attributed to tidal heating.

What primarily causes the structural differentiation observed in Io and Europa, leading to rock/iron cores?
astronomyJupitersolar systemformationmoons