Question

Of the major moons of the solar system: appears to have an a. ocean beneath its cracked icy crust. has an atmosphere of b. methane. has the most C. volcanic activity of any object in the solar system.

Answer 1

Europa, one of the four Galilean moons of Jupiter appears to have ocean under its ice crust.

Saturn's moon Titan has an atmosphere of Methane.

Jupiter's innermost moon Io is the most volcanically active body in the solar system. This is because of gravitational tides created by Jupiter (due to large mass) and the neighboring moons.