Together, surface and deepwater currents form the “global conveyor belt,” which circulates seawater over a 1,000-year journey ...

NASA's SWOT satellite has revealed unseen ocean depths, mapping seafloor features that shape life, currents and tectonics.

Yet the ocean is very familiar to more than three billion people whose livelihoods depend directly on coastal and marine ecosystems—about 8 percent of the world's people are fishermen.