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Nobody really knows when the cave was formed by its estimated about 500 to 550 million years ago.
The Cave was first discovered in 1924 by an Indian Tribe.
Cave divers found mammal fossils belonging to the Saber-toothed tiger and the giant ground sloth.  They were both alive around 6000 - 10 000 years ago in the Pleistocene Era.
The cave as been open to tourist for only about a decade.

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Underwater view of the Blue Lake Cave where fossils have been found

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The Blue Lake Cave is Limestone, which Limestone is sedimentary rock, and
is made up mostly of the mineral calcite.  It also has amounts of clay, silt, and sand. There are stalactites and other different cave formations within the cave.

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The stalactite formed of calcium salts deposited by dripping water.

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The Blue Lake Cave is located in the city of Bonito, on the country Brazil.  Brazil is on the South American plate.  And the Blue Lake Cave is on a continental plate.  There has been no recorded movement or plate activity.

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Located 20 km from the city of Bonito, inside a forest.  You need to cross a a very long trail to the lake bed.

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Tropical and subtropical coniferous forests

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Constructive forces and Destructive forces

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Constructive forces and Destructive forces

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The cave only has one constructive force,  deposition helped shape the  land form.

On the other hand, destructive forces are erosion and weathering they broke down the rock.

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The "Blue color" in the water, which is just an effect from the sunshine

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* It's one of the biggest water flooded caves on the planet

* The water is really clear that you can see the bottom of the lake with your eyes

* The are large amounts of limestone, which acts like a natural filter for the water.  This is why the water is so clear.

* The sunshine cause the blue shade of water even if it crystal clear.

* People can going snorkeling in the blue clear water next to geological cave formations

*It is believed there is an underwater river that fills the lake.

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Some people believe that the cave was formed like:
* Erosion and weathering broke the rock into a cave.
* Deposition help form and shape the cave and different cave formations within the cave.
* An underwater river that filled the lake.

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Cusano, J., Rigters, R., Joseph, D., & Rigters, R. (2016, March 16). The cave with the mysterious blue lake in Bonito. Retrieved February 26, 2020, from https://thatwanderlust.com/grutadolagoazul/

Brasil, V. (2020). Gruta do Lago Azul (Blue Lake Cave) | Visit Brasil. [online] Visit Brasil - Site oficial de turismo do Brasil. Available at: https://www.visitbrasil.com/attractions/gruta-do-lago-azul-blue-lake-cave.html [Accessed 25 Feb. 2020].

Blue Lake Cave Formation. (n.d.). Retrieved February 25, 2020, from https://sites.google.com/site/bluelakecaveformation/home

Gruta Do Lago Azul: The Blue Lake Grotto. (2010, May 14). Retrieved February 25, 2020, from https://www.atlasobscura.com/places/gruta-do-lago-azul-the-blue-lake-grotto

Brasil, V. (2020). Gruta do Lago Azul (Blue Lake Cave) | Visit Brasil. [online] Visit Brasil - Site oficial de turismo do Brasil. Available at: https://www.visitbrasil.com/attractions/gruta-do-lago-azul-blue-lake-cave.html [Accessed 25 Feb. 2020].

10 Interesting Facts About the Lago Azul Cave - Bonito Way | Bonito Way Agência de Viagem. (2020). 10 Interesting Facts About the Lago Azul Cave - Bonito Way | Bonito Way Agência de Viagem. [online] Available at: https://www.bonitoway.com.br/en/novidades/10-interesting-facts-about-the-lago-azul-cave [Accessed 25 Feb. 2020].