Figure 3.4 Cross-Section of the South Atlantic along 25°S showing the continential shelf offshore of South America, a seamount near 35°W, the mid-Atlantic Ridge near 14°W, the Walvis Ridge near 6°E, and the narrow continential shelf off South America. Upper: Vertical exaggeration of 180:1. Lower: Vertical exaggeration of 30:1. If shown with true aspect ratio, the plot would be the thickness of the line at the sea surface in the lower plot.