The Atlantic Is the Second-Largest Ocean and Covers About 20% of Earth's Surface

This powerful current flows from the Gulf of Mexico toward Europe and helps keep the climate of Western Europe milder than its latitude suggests.

The wreck was found in 1985 at a depth of about 3,800 meters, roughly 600 kilometers off Newfoundland.

Bounded by ocean currents instead of land, the Sargasso Sea is named for the floating Sargassum seaweed that gathers there.

Running roughly 16,000 kilometers, the ridge marks where tectonic plates are pulling apart, widening the ocean by a few centimeters each year.