Answer:
The following are the correct answers for each question:
1) Option c: icy debris.
2) Option b: biochemical cycling.
3) Option a: gravity.
The arrival of icy debris in the early days of Europa's existence could have formed its ocean. It is likely that the water experienced biochemical cycling, similar to Earth. It is also possible that this water is retained beneath Europa's surface and in its atmosphere due to Europa's gravity.
Explanation:
Europa is the smallest of the four satellites that orbit Jupiter. It was discovered by Galileo Galilei on January 8th, 1610 and this is why Europa and the rest of Jupiter's satellites are known as Galilean moons. Although its surface is frozen, scientists believe that underneath it there is an ocean similar to the ones we have on Earth and that due to the moon's gravity the water is retained beneath Europa's surface. It is also believed that the many cracks that are visible on the surface are cause by the movement of the ice and water from the ocean that lays underneath, which would show that it is in an active state. Europa is the smallest but most important Jupiter's moon due to the possibility of having a very similar to Earth Ocean, which would be capable of having live within it.
