May 16, 2025
A recent study has found that the Earth’s oceans were green in colour about 2.4 billion years ago. Scientists believe the reaction between ferrous iron present in the water and oxygen generated by cyanobacteria led to this outcome at the time.
The reaction gave rise to particles resembling rust called iron hydroxide. This material allowed the passage of green light through; however, it soaked up the blue and red wavelengths of light, giving the water a green colour.
DID YOU KNOW?
The Pacific Ocean spans approximately one-third of the surface of the Earth.
Image for representational purposes
ACTIVITY: Water World
Name all the 5 oceans on Earth.
