Most nutrients are found in the bottom layers, but algae thrive in the top layers, where the sun shines, as they need light to grow. The result of all these factors is the clear, blue water that all mediterranean divers know and love so well.
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The ocean is blue because water absorbs colors in the red part of the light spectrum. Like a filter, this leaves behind colors in the blue part of the light spectrum for us to see. The ocean may also take on green, red, or other hues as light bounces off of floating sediments and particles in the water.
The sediment in Hawaii's oceans is made up of volcanic rock, coral, and shells which are heavy and not easily stirred up. The sediment quickly settles on the ocean floor, keeping the water clear.
This MODIS image of blue water in the Caribbean Sea looks blue because the sunlight is scattered by the water molecules. Near the Bahama Islands, the lighter aqua colors are shallow water where the sunlight is reflecting off of the sand and reefs near the surface.
The Weddell Sea has been claimed by scientists to have the clearest waters of any ocean in the world. Described by a historian as “the most wretched and dismal region on earth”, due to the flash freezes that caught Shackleton's ship, its clarity is only belied by the sheer depth of the ocean below.
Yes, it is safe to drink and use tap water on the island of O?ahu including in Waikiki. The Board of Water Supply in Hawai?i works in conjunction with State and Federal agencies, such as the U.S. Environmental Protection Agency and Hawai?i State Department of Health, to ensure the water in Hawai?i is safe to drink.
Now, thanks to the U.S. military and overtourism, the people of Hawaii are facing one of the largest water crises they have ever seen. Navy fuel contamination has severely threatened their water supply, posing dangerous health risks, while the tourism sector guzzles water as usual.
Many of the Florida Keys' beaches are manmade, or are just a layer of sand over a sliver of limestone. The north is almost always cooler than south, something to remember in both summer and winter.