Because the Earth's first atmosphere/ocean system didn't have free oxygen, dissolved iron accumulated in the oceans, giving them a green color. As oxygen became available, it combined with the iron and settled to the sea floor to form banded iron formations (BIFs). Once the iron was "rusted" out of the water column, the ocean color changed from green to blue.
no not really
97.5% of Earth's water is found in the oceans. 2.5% is found in freshwater lakes.
The gravitational forces of the Sun and Moon, effect the earths oceans by forming tides.
oceanography
Arctic
70% or 80% of water covers the earths surface
72.1%
oceans, in solution.
The Oceans
no
amospher
It was about 4 billion years ago, that the Earths oceans formed