A five-week expedition to map and sample a giant underwater canyon off the northwest coast of Morocco has completed its mission, yielding the best look yet at the deep-sea wonder. More than half a mile (about 1 kilometer) deep, 280 miles (450 km) long and
A five-week expedition to map and sample a giant underwater canyon off the northwest coast of Morocco has completed its mission, yielding the best look yet at the deep-sea wonder. More than half a mile (about 1 kilometer) deep, 280 miles (450 km) long and
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