About 71% of the Earth is covered in water and the average depth is 12,080 feet — which is nearly as deep as Mount Fuji is tall, according to Woods Hole Oceanographic Institute. Only 5% of the ...

The cold-water reefs are about a quarter of a mile beneath the sea surface, and the larger one is about a half-mile long. Both are in the Galápagos Marine Reserve, one of the world’s largest ...