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Usually, algae (AL jee) -- tiny plants. Algae can grow on surface of the water or on rocks and other stuff on the bottom. Sometimes it's not the water that's green, but the lake bottom or stream bottom. In shallow areas, sunlight reflects off the algae growing on the bottom and makes the water look green.

High concentrations of copper can also make water look green.

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โˆ™ 2011-01-08 22:03:55
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Q: What makes water green?
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