The ocean can be many colors, but for the most part it's deep blue. But why? And what's up with green or brown or red water?

Earth's oceans may have been green for billions of years until the first photosynthetic organisms flooded our atmosphere with oxygen.

Although the Earth’s been decidedly blue for 600 million years, rising populations of phytoplankton caused by rising ...

The ocean covers nearly three-quarters of our planet but scientists say we have barely scratched the surface of what lives in ...

A crystal-blue ocean stretching to the horizon ... they will absorb and scatter radiation at different wavelengths. The light’s wavelength determines the color we see with our eyes.