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The blue appearance of the open oceans is due to the reflection off the "blue" sky. On an overcast day, the sea will look rather grey. Close to a sandy shore, the agitated water will be brown due to carrying a lot of sand grains. If the shore is rocky, due to less sand grains, the water will appear clearer, and an observer would be able to see the seabed.

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∙ 10y ago

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