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Unfortunately, the simple explanation is made a bit more complex by whether you live in the United States or in the United Kingdom ;-)
If you live in the United States:
The ocean is blue because pure, clear water has a VERY light blue color.
If you live in the United Kingdom:
The ocean is blue because pure, clear water has a VERY light blue colour.
If you live anywhere else, you unfortunately have to decide for yourself which of these 2 explanations are correct ;-)
On a cloudy day when the sky appears grey, the ocean appears gray too (it reflects the sky).
High concentrations of plankton make the ocean appear blue-green.
A special thanks to Dr. Sandra Cruz-Pol for pointing out the error on this webpage.
5 online quizzes to test your understanding of this explanation
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