This image shows the terrain of Europa.
Click on image for full size
Image courtesy of NASA
Now let's move on to the fourth point. The geologic unit called "global linea" suggests a process called "sea floor spreading", or perhaps "pull apart features". In this process, the crust separates and spreads apart. On Earth, the crust which separates and spreads apart is made of rock. On Europa, the crust is made of ice.
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