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Message: <blockquote data-quote="Wolverine GTR" data-source="post: 19638982" data-attributes="member: 158020">-The Blue River-Rio Celeste- Winding through the verdant rainforest of Tenorio Volcano National  Park of Costa Rica, is a bright blue river called Rio Celeste. The river  is formed by the confluence of two smaller rivers called the Sour Creek  and the Good View River. At precisely the point where the waters of the  two completely transparent rivers meet, that the blue color starts. For  that reason, this point is known as El Teñidor, which means “The Dyer”  in English.   Until very recently, scientist were unable to fully  explain why Río Celeste has such a distinctive turquoise coloration.  Many hypotheses were put forward such as the water contained copper or  calcium carbonate and sulfur, or that the river’s proximity to the  Tenorio Volcano caused it have the blue color. It is now known that the  blue color arises due to a physical phenomenon known as Mie scattering  triggered by the presence of certain minerals in the river’s water that  causes sunlight to reflect in such a manner that it gives the water its  incredible hue.   <img src="https://lh3.googleusercontent.com/-plANZqem4RE/VqnF2uwR4BI/AAAAAAABLKA/6jNRoYvAP4o/rio-celeste-3%25255B6%25255D.jpg?imgmax=800" alt="" class="fr-fic fr-dii fr-draggable " style="" />   As  already mentioned, Río Celeste is fed by two rivers — Sour Creek and  Good View River. The Good View River carries significant quantities of a  type of whitish mineral known as aluminosilicate, that is composed of  aluminum, silicon and oxygen. This is the mineral that is responsible  for reflecting the blue color in sunlight. But if the mineral is also  contained in the Good View River, why doesn’t it appear blue like Río  Celeste? The answer lies in the size of the particles.   Researchers  found that Good View River particles have a size of 184 nanometers,  while in the Río Celeste the particles are much larger at 566 nm.   “This  increase in size is what causes the scattering of sunlight, such that  it occurs principally in the blue region of the visible spectrum. So  that’s why we have that spectacular light blue color of the Rio Celeste”  said Dr. Max Chavarría Vargas, lead investigator.   But why are  the aluminosilicate particles in Río Celeste bigger than those in Good  View River, when the particles itself came from the Good View River? It  so happens that Sour Creek, the second river to join Good View River, is  highly acidity due to volcanic activity (which is why it’s called Sour  Creek). When these two streams mix to form Río Celeste, the drop in pH  causes the aluminosilicate particles to aggregate and enlarge producing  Mie scattering which gives the river a strong turquoise color.   “It’s  one of those quirks of nature where one of the rivers provides mineral  material with one size and the other river provides the acidic  environment so that those particles grow,” said Dr. Max Chavarría  Vargas.   <img src="https://lh3.googleusercontent.com/-3PfD5giVXpY/VqnF3-vX9bI/AAAAAAABLKI/jU1DpIRb_eQ/rio-celeste-7%25255B6%25255D.jpg?imgmax=800" alt="" class="fr-fic fr-dii fr-draggable " style="" />   <img src="https://lh3.googleusercontent.com/-yaaDiSpekkU/VqnF5O4szlI/AAAAAAABLKQ/3WjjxLOs0hw/rio-celeste-5%25255B6%25255D.jpg?imgmax=800" alt="" class="fr-fic fr-dii fr-draggable " style="" />   <img src="https://lh3.googleusercontent.com/-uqvcosS_Sks/VqnF6isTo2I/AAAAAAABLKY/GfEgW5KeSuE/rio-celeste-6%25255B6%25255D.jpg?imgmax=800" alt="" class="fr-fic fr-dii fr-draggable " style="" /> The point where the two rivers mix. See how the color changes abruptly.   <img src="https://lh3.googleusercontent.com/-yzpznVGUmzQ/VqnF8MtpSDI/AAAAAAABLKg/W81l-T2aYnQ/rio-celeste-2%25255B2%25255D.jpg?imgmax=800" alt="" class="fr-fic fr-dii fr-draggable " style="" />   <img src="https://lh3.googleusercontent.com/-9r3RpRkmQek/VqnF9K98dsI/AAAAAAABLKo/opKZ0AZ5ZH0/rio-celeste-4%25255B2%25255D.jpg?imgmax=800" alt="" class="fr-fic fr-dii fr-draggable " style="" />   <img src="https://lh3.googleusercontent.com/-UotfM-wDsKA/VqnF-eZNeeI/AAAAAAABLKw/U3RENAV3q9s/rio-celeste-1%25255B6%25255D.jpg?imgmax=800" alt="" class="fr-fic fr-dii fr-draggable " style="" /></blockquote>

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