The sea is blue because the sunlight is reflected back to our eyes from the water molecules or from very minute particles suspended in the sea. In th… - Rachel Carson

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The sea is blue because the sunlight is reflected back to our eyes from the water molecules or from very minute particles suspended in the sea. In the journey of the light rays downward into the water and back to our eyes, all the red rays of the spectrum and most of the yellow have been absorbed, so it is chiefly the cool, blue light that we see.