Caribbean and North American plates. This means that it is currently being deformed by the tectonic stresses caused by the interaction of these plates. Deep oceans waters fringe Puerto Rico. To the west, the Mona Passage, which separates the island from Hispaniola to the west, is about 80 miles (130 km) wide and more then 3,300 feet (1,000 meters) deep. Off the northern coast in the Atlantic Ocean at the boundary between the Caribbean and North American plates is the Puerto Rico Trench, the largest…
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