<p><strong>Fig. 7.28.</strong> In this computer model of the ocean floor north of Puerto Rico, Caribbean Sea, western central Atlantic ocean basin, the purple areas indicate the Puerto Rico Trench, 8.6 km below the ocean surface. It is the deepest point in the Atlantic ocean basin.</p>

Fig. 7.28. In this computer model of the ocean floor north of Puerto Rico, Caribbean Sea, western central Atlantic ocean basin, the purple areas indicate the Puerto Rico Trench, 8.6 km below the ocean surface. It is the deepest point in the Atlantic ocean basin.

Image courtesy of the United States Geological Survey (USGS), Wikimedia Commons