In the case of glacial lakes, the colour is caused by runoff when nearby glaciers melt. Water from the glaciers contains particles of silt or rock flour, and the sun reflects off these particles, creating blue and green wavelengths of light.
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Fine particles of pulverized rock absorb and scatter sunlight in ways that can give water a striking blue-green color.
Blue and turquoise lakesIt's due to the tiny glacier particles, which sink only slowly to the bottom. The purity of the lake's waters allow these particles to come into their own. The colours are particularly beautiful in spring, when the glaciers begin to melt.
Scientists attribute the lake water's clarity to its passage underground from Lake Constance, which filters out nearly all the particles suspended in the water. Its clarity reveals water's natural blue-violet colour.
1. The Maldives. The Maldives, located in the Indian Ocean, have around 1,190 islands and sandbanks. A lagoon with crystal clear water encircles all the islands, which are protected by a reef structure that is home to an array of underwater life.
White sand, no silt and shallow water are the main reasons for the pale blue/green colour of the carribean waters. The areas that have the cleanest, clearest waters are regions where the islands are surrounded by coral reefs, the white sand is coral debris and fragments of sea shell.
Stay out of the water ifCloudy water can be a warning that there are more germs in the water than normal. Discolored or smelly water could mean there is a harmful algal bloom (HAB) in the water.