To know the answer to this question, you must first understand that sunlight is made up of different colours, from red, orange, and yellow, to green, and blue.

When sunlight falls on the sea, it is the colour blue that is reflected by the water most easily, giving the sea its blue colour. Near the coast, sea water takes on a yellow or brownish tinge. This is due to the mud that rivers discharge into the sea, and the vast number of tiny plants and animals near the surface.

When clouds hide the sun, the sea will look grey. Weather conditions can also change the colour of the sea.



  1. Although I’m awed by beautiful oceans’ blue and green, I’m also left more concerned about the increasing plastic entanglement mess hazardously dumped into them.

    How does humankind correct its collective addiction to disposability when—regardless of scuba divers’ reports of immense tangled plastic messes (not to mention plastic bags found at some of the ocean’s deepest points)—so much of it is not immediately observable, i.e. out of sight, out of mind, thus misperceived as no threat to us?

    It doesn’t surprise me, as general human mentality collectively allows us to, amongst other forms of blatant pollution, throw non-biodegradables down a dark chute like we’re safely dispensing it into a black-hole singularity to be crushed into nothing.

    And then there’s the astonishing short-sighted entitled selfishness. I observed this not long ago when a Global
    TV news reporter randomly asked a young urbanite wearing sunglasses what he thought of government restrictions on disposable plastic straws. “It’s like we’re living in a nanny state, always telling me what I can’t do,” he recklessly retorted.

    And I can imagine the feeling being mutual in most of the impoverished southern hemisphere.

    Liked by 2 people

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