But what if this wasn't always the case, and our oceans used to be green? That's the surprising ... the oceans may appear purple due to intense volcanic activity and low oxygen in the atmosphere.

Earth's oceans could one day turn purple. Nearly three fourths of Earth is covered by oceans, making the planet look like a pale blue dot from space. But Japanese researchers have made a compelling ...

It will lead to more purple, brown, or green hues in coastal or stratified areas, with less deep blue color in water as phytoplankton decline. Eventually, oceans will evaporate completely as the ...