[Scale: 140 x 140 miles. Smallest discernable feature: 914 yards across.]
Solving the Wedges Puzzle:
This image of Europa shows a region where large wedge-shaped bands appear
to flow across the surface; however, symmetric ridges within the dark bands
suggest that it is the crustal plates on either side that have fractured and
moved apart. At the same time, the spaces between the plates were filled in
with material from below. This process is similar to spreading centers
in the ocean basins of Earth. Linear features on opposite sides
of the dark wedges can be matched up like pieces of a jigsaw puzzle.
Extended Caption