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WAS THE SEA ALWAYS BLUE?
BBC Science Focus
|September 2025
Our planet has had an ocean for around 3.8 billion years, but new research suggests it hasn't always been blue.
Away from coastal areas, the sea today is blue because of the way water absorbs longer wavelengths of sunlight towards the red end of the spectrum. This leaves the shorter, bluer wavelengths to penetrate deeper, scattering and reflecting back into our eyes.
Diese Geschichte stammt aus der September 2025-Ausgabe von BBC Science Focus.
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