Moons of Jupiter

I have been learning about moons this week and I think the moons of Jupiter are very interesting. Jupiter is the largest planet in our solar system so it has a stronger magnetic field, that is why it has so many moons. Jupiter has 67 moons. Galileo discovered four of Jupiter's biggest moons, they are called the Galilean moons. Ganymede is the biggest moon of Jupiter and has the biggest magnetic field. It is 5270km wide and it's made of iron core, silicate lower mantle, icy upper mantle and ice crust. Callisto has a magnetic field but it's less strong then Ganymede and it's 4800km wide and made of a ice rock interior and ice rich outer layer. Io doesn't have a magnetic field but it has a orange, red, yellow and black surface and it's the most volcanic moon in the whole solar system. It has over 400 active volcanoes. Europa has salty water that contains carbon that could be life forms. I think Europa would have to be my favourite because of it's salty water that could hold life forms.