Why is it that when you put pour water into a glass, its clear, but in a lake or a river its green?

when you go to a lake or a river the water green, but if you take a cup and get water from the lake or river its clear. how exactly does that work?Why is it that when you put pour water into a glass, its clear, but in a lake or a river its green?
FiltrationWhy is it that when you put pour water into a glass, its clear, but in a lake or a river its green?
The green, or blue green colour of water in bulk (as in a river or sea) is due to the absorption of the red and yellow parts of the spectrum by the water molecules, leaving the green and blue. In addition, the blue light gets scattered by the water molecules. These effects are only noticed in a large volume of water, and you don't notice it in a glassful.


(For the same reason, looking across your street, the air is clear; but look up into the sky, and you see the blue colour caused by scattering; because you are looking up through several kilometres of sky.





In addition, if the water in the river or lake contains suspended solid particles such as fine clay' the scattering effect is multiplied by an effect called tyndall scattering. That is why flooded quarries are sometimes intensely blue.





In the sea; the green colour may also be accentuated by chlorophyll-containing phytoplankton (microscopic plants) in the sea water.
well hopefully your drinking water has had the algae filtered out of it, and the sediment has been removed or allowed to settle to the bottom. Natural surface water is actually a whole ecosystem in itself.
Algee, fish and wildlife feces and a bunch more micro-organisms

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