How many layers does europa?

Europa, one of Jupiter's moons, is believed to have a layered structure consisting of an outer icy shell, a subsurface ocean of liquid water, and a rocky mantle beneath. The ice shell is estimated to be several kilometers thick, while the ocean beneath may be 60 miles (about 100 kilometers) deep. This layered composition makes Europa a key target in the search for extraterrestrial life within our solar system.