The surface is illuminated artificially from the northwest in order to show the finer details. As mentioned in section 5.2 the mean sea surface over the oceans show a lot of details from bottom topography. In Figure 5 we can see a number of seamounts and islands. Bermuda, the Cabo Verde Islands, and on the southern hemisphere, St. Helena, the Walvis Ridge, and Discovery Seamount are visible. The Mid Atlantic Ridge is also visible, with numerous fracture zone running perpendicular to it.
Some fracture zones extend into the abyssal plains.
South of the Ridge we can see the Gibbs Fracture Zone, Iceland is located in the northeast corner of the map. Gravity anomaly map of the Norwegian Sea. A number of ridges are visible between Greenland and Norway. The ridge running from Iceland to the northeast is an active spreading ridge. Also some old ridges are visible.