Summary:
- This study suggests that Earth's ancient oceans were once green in color, unlike the blue-green oceans we see today.
- The researchers analyzed the chemical composition of volcanic waters and found that they contained high levels of dissolved iron, which could have given the ancient oceans a green hue.
- This green ocean period may have lasted for billions of years before the rise of oxygen-producing organisms, which led to the blue-green oceans we know today.