Oceans cover more than two-thirds of the surface of the planet - yet they are still not fully understood.
The world's oceans play an important role in the Earth's climate system, and millions of people depend on them directly for sustenance. People also traverse the oceans, and use them to transport goods. Yet the world's oceans are in trouble, as warming and acidification take their toll. They've also become a garbage dump for the planet, with consequences for marine life.
Most people know of corals along coastlines - but there are also beautiful corals growing in deeper waters. Researchers at the GEOMAR Institute in Kiel, Germany, are running tests to see how these corals react to warmer and more acidic waters. Results are mixed.