What Do We Really Know About The Ocean Floor? 

We’ve always had an idea of what the bottom of the ocean might look like. We know thatit contains the largest mountain ranges on earth–canyons that make the Grand Canyon look puny and  cliffs with three-to-four mile drop-offs. Some critics have pointed out that we’ve explored space more than our own oceans. Oceanographer David G. Gallosaid we’ve explored less than 10 percent of this planet–perhaps less than 5 percent

Source: What Do We Really Know About The Ocean Floor? | TestTube

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