The Moons of Jupiter: PTE Listening: Fill in the Blanks practice questions

Jupiter possesses several large natural satellites, but none exhibits more violent than Io. Unlike the icy worlds further out, Io experiences constant gravitational tugging between Jupiter and neighbouring moons. This intense tidal friction generates immense internal which continuously melts rock beneath the frozen crust. As a consequence, hundreds of active erupt across the surface, ejecting plumes of sulphur hundreds of kilometres into space. Planetary scientists have observed that this ongoing resurfacing completely erases impact craters, making Io the most geologically body known in the outer solar system.

Ganymede is distinguished as the largest satellite in the solar system, even exceeding the planet Mercury in physical size. What makes this giant world truly is its intrinsic magnetic field, which no other moon possesses. Scientists believe this field is generated by a liquid iron core undergoing rapid deep within the interior. When charged particles from Jupiter strike Ganymede, brilliant glowing ribbons form in its thin atmosphere. Studying these unique auroral displays allows researchers to estimate the salinity and depth of a massive saltwater ocean hidden beneath the moon crust.