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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.
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Related Questions
Does the earths hydrosphere only include Earths oceans?
no not really
What percent of earths water is found in oceans?
97.5% of Earth's water is found in the oceans. 2.5% is found in freshwater lakes.
How does the moon and the sun effect the earths oceans?
The gravitational forces of the Sun and Moon, effect the earths oceans by forming tides.
What is a study of earths oceans?
oceanography
How much of earths oceans cover earths surface?
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Were oceans caused by the moving of the earths surface?
no
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amospher
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Did earth first oceans form?
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