Earth's oceans, known for their deep blue hue, could one day undergo color shifts, say scientists. A report based on a study ...

But experts insist that the ocean's hue is far from stable - as it is wholly dependent on water chemistry and its influence on the organisms that live underwater. For example, high volcanic ...

THE Earth's ocean could one day turn purple - and scientists say it used to be a totally different colour. The Earth's seas have been predominantly blue for around the last 600 million years.