Question: is el yunque a volcano?
Answer: El Yunque is a remnant of an ancient supervolcano named Hato Puerco. The volcano was one of the region's largest and most active volcanoes during the Cretaceous period 145-66 million years ago. "El Yunque's hardness and chemical properties came from being 'cooked' in the chamber of the volcano," says Willenbring.