Answers:
First of all, it depends on the sea, ocean or river. If you're talking East River in NYC, or some portions of the Hudson River, it's not green at all, it's brown, with a few corpses here and there, some garbage. The Yangzte River is yellow, reflecting its gold sands. The Chicago River is bright green because it's treated.
The red sea appears brownish red when the blue/green seasonal algae die off.
On cloudy days the ocean looks dark grey, on sunny days, blue because it reflects the sky as the above answerer noted. And that also depends upon how clean the water is, and how deep. Shallower water holds the sky's blue color much better than deep, because the sand acts as a barrier, further bouncing the sun's rays. Tinges of green in the ocean are from plankton and other organisms as correctly noted above, thus sometimes giving it a turquoise to green hue.
Algae grows in the river water to give it green colour. Sea water mostly reflects the sky's blue colour.
c water dont have color
but green algae that grow in that give its background
in sea u c the dispersed light of the sun (blue can be more dispersed) so only blue ,voilet,..can be seen alltogether it ll give a blue color
The way I've seen them, the colors of rivers and seas change with the the weather...
But in calm weather, I think a river is green because it's shallower than the ocean, or sea, and rivers also carry fresh-water organisms that probably add to that color.
The sea appears blue because of its depth and, again, because of the organisms in it...and the sky above...(I almost feel like writing a poem or something!...) and like that.
I think. Anyway, it's a fine sight to see a big river meet the sea, isn't it?
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