joigus Posted November 22, 2020 Author Share Posted November 22, 2020 50 minutes ago, Ghideon said: (Getting into a better position or angle to take the pictures was not worth the risk. Or maybe I was getting too old and lazy) That was amazing. Link to comment Share on other sites More sharing options...
QuantumT Posted November 22, 2020 Share Posted November 22, 2020 Icelandic ice cave (I use this image as background of my lock screen) , Dripstone cave in Germany 2 Link to comment Share on other sites More sharing options...
michel123456 Posted November 22, 2020 Share Posted November 22, 2020 Frozen stone on Baikal lake. https://www.theatlantic.com/photo/2019/05/lake-baikal-ice-formations-photos/590374/ 2 Link to comment Share on other sites More sharing options...
joigus Posted November 22, 2020 Author Share Posted November 22, 2020 Thanks a lot. Today has been a good day for beauty and wonder. Link to comment Share on other sites More sharing options...
joigus Posted November 24, 2020 Author Share Posted November 24, 2020 On 11/22/2020 at 5:36 PM, joigus said: That's quite common between men my age. @MigL: I meant 'that's quite common among men my age.' Never a bad choice of preposition was as open to misinterpretation as this once. Link to comment Share on other sites More sharing options...
joigus Posted December 6, 2020 Author Share Posted December 6, 2020 (edited) The tepuis (tepuyes in Spanish) from Venezuela, Brazil, Guyana and Colombia. Karst topography is awesome almost beyond words or concepts. But not beyond belief, because it's there. https://en.wikipedia.org/wiki/Tepui Quote These table-top mountains are the remains of a large sandstone plateau that once covered the granite basement complex between the north border of the Amazon Basin and the Orinoco, between the Atlantic coast and the Rio Negro. This area is part of the remnants of the supercontinent Gondwana.[3] Throughout the course of the history of Earth, the plateau was eroded, and the tepuis were formed from the remaining monadnocks. Because the first continents had no plant cover to protect them from erosion, for eons upon eons sediments formed over vast regions, which later became exposed to more selective wearing down, sculpting canyons, plateaus, grottos, and seemingly bottomless chasms. That's what a blind, unconstrained by intention, relentless force can do. No thinking is necessary, if given enough time. Gigantic pillars carved out of the depositions of a long-lost world, where once big dinosaurs roamed, and tiny mammals scurried around, waiting for their moment to arrive, these monuments are silent, patient witnesses to the existence of Gondwana. No human-made temple is remotely comparable to this. No religious feeling can echo in our minds what the first people coming from the Bering Strait must have felt when they first saw this more than 15'000 years ago. Picture from: https://hananpacha1.wordpress.com/2017/07/07/tepuy/ (In Spanish.) Edited December 6, 2020 by joigus 2 Link to comment Share on other sites More sharing options...
michel123456 Posted December 6, 2020 Share Posted December 6, 2020 39 minutes ago, joigus said: No human-made temple is remotely comparable to this Similar situation where monks decided to build their monasteries, the meteora in Greece. The natural beauty enhanced by baffling human creativity. Meteora net lift, 1908 by Frédéric Boissonnas: https://en.wikipedia.org/wiki/Frédéric_Boissonnas 2 Link to comment Share on other sites More sharing options...
joigus Posted December 6, 2020 Author Share Posted December 6, 2020 16 minutes ago, michel123456 said: Similar situation where monks decided to build their monasteries, the meteora in Greece. The natural beauty enhanced by baffling human creativity. Thank you. I'll add some more from Wikipedia, for completion. Quote Beside the Pindos Mountains, in the western region of Thessaly, these unique and enormous columns of rock rise precipitously from the ground. But their unusual form is not easy to explain geologically. They are not volcanic plugs of hard igneous rock typical elsewhere, but the rocks are composed of a mixture of sandstone and conglomerate. The conglomerate was formed of deposits of stone, sand, and mud from streams flowing into a delta at the edge of a lake, over millions of years. About 60 million years ago during the Paleogene period[5] a series of earth movements pushed the seabed upward, creating a high plateau and causing many vertical fault lines in the thick layer of sandstone. The huge rock pillars were then formed by weathering by water, wind, and extremes of temperature on the vertical faults. It is unusual that this conglomerate formation and type of weathering are confined to a relatively localised area within the surrounding mountain formation. https://en.wikipedia.org/wiki/Meteora 1 Link to comment Share on other sites More sharing options...
Curious layman Posted January 5, 2021 Share Posted January 5, 2021 Can't Believe I forgot about these. Cave of the Crystals Quote The cave was discovered in April 2000 by brothers Juan and Pedro Sanchez while drilling in the mine. As of October 2015, the mine had reflooded and the cavern filled once more with the water rich in minerals required for the crystals to grow. 2 Link to comment Share on other sites More sharing options...
MigL Posted January 5, 2021 Share Posted January 5, 2021 Looks like somebody trashed the memory crystals in Superman's Fortress of Solitude. No seriously … very nice ! 2 Link to comment Share on other sites More sharing options...
joigus Posted January 5, 2021 Author Share Posted January 5, 2021 11 hours ago, Curious layman said: Can't Believe I forgot about these. Cave of the Crystals Amazing. Quoted from Wikipedia article: Quote The main chamber contains giant selenite crystals (gypsum, CaSO4 • 2H2O), some of the largest natural crystals ever found.[1] The cave's largest crystal found to date is 12 m (39 ft) in length, 4 m (13 ft) in diameter and 55 tons in weight. When it was accessible, the cave was extremely hot, with air temperatures reaching up to 58 °C (136 °F)[2] with 90 to 99 percent humidity. The cave is relatively unexplored because of these factors.[3] Without proper protection, people can only endure approximately ten minutes of exposure at a time.[4] Link to comment Share on other sites More sharing options...
joigus Posted January 5, 2021 Author Share Posted January 5, 2021 Another ridiculously beautiful one is brine pools (underwater lakes). They really look like lakes or rivers of underwater water. --------------------------- From Wikipedia: https://en.wikipedia.org/wiki/Brine_pool Quote Examples[edit] Afifi[20] Atlantis II[21] Conrad[22] Discovery[23] Kebrit[24] Kryos [25] L'Atalante basin Orca Basin Shaban[26] ---------------------------------- From: http://valorielord.com/index.cfm/blog/underwater-lakes-and-rivers/ Quote In some areas, the seafloor contains thick layers of salt, some miles long and deep, and when seawater seeps through this dense salt and mixes with it, the resulting seawater is a heavy brine, which is much denser and heavier than regular seawater. This brine separates from the surrounding seawater the same way oil and water will separate when mixed, and the brine settles into holes and depressions in the seafloor, forming lakes, ponds, and yes, even rivers. Link to comment Share on other sites More sharing options...
StringJunky Posted February 18, 2021 Share Posted February 18, 2021 (edited) The cold in the lower US right now is springing up some unexpected ice art: Edited February 18, 2021 by StringJunky 1 Link to comment Share on other sites More sharing options...
joigus Posted February 18, 2021 Author Share Posted February 18, 2021 49 minutes ago, StringJunky said: The cold in the lower US right now is springing up some unexpected ice art: <video> Beautiful. No need to explain. I just saw the number of views of this thread and I almost can't believe it. Link to comment Share on other sites More sharing options...
joigus Posted February 21, 2021 Author Share Posted February 21, 2021 Rainbow mountains in China, Iceland, and Peru. China: Zhangye national geopark: https://en.wikipedia.org/wiki/Zhangye_National_Geopark https://en.wikipedia.org/wiki/Zhangye_National_Geopark Iceland: Landmannalaugar region. From https://www.kimkim.com/c/iceland-best-hiking-regions https://en.wikipedia.org/wiki/Landmannalaugar Peru: Vinicunca mountains: https://bookatrekking.com/en/trekking/peru/rainbow-mountain/ https://en.wikipedia.org/wiki/Vinicunca In all three cases I've provided links to both tourism-oriented websites, and a Wikipedia articles with more details about geological aspects. Some of the different colours can be attributed to differential oxidation/composition of the strata. In other cases, like the Icelandic one, sulfur from volcanic activity must be involved. The photos may be oversaturated in some cases. Link to comment Share on other sites More sharing options...
joigus Posted April 13, 2021 Author Share Posted April 13, 2021 Starlings, a new state of matter? (lots of minutes, I've cut the last video.) How do they do that? Remind me of cellular automata. But far more amazing. 2 Link to comment Share on other sites More sharing options...
zapatos Posted April 14, 2021 Share Posted April 14, 2021 When I was young I used to see those giant flocks of starlings all the time. I was always mesmerized by them. I still see them occasionally, and while they are much smaller flocks they still do that dance in the sky. 1 Link to comment Share on other sites More sharing options...
iNow Posted April 14, 2021 Share Posted April 14, 2021 They remind me of schools of fish, just “swimming” through a different fluid. 1 Link to comment Share on other sites More sharing options...
joigus Posted April 14, 2021 Author Share Posted April 14, 2021 Yes, wonderful illustration of patterns emerging from collective behaviour. Taken one by one these starlings seem quite "vulgar" as compared to other, more beautiful, birds. But when they team up to do this in the sky, they truly are a wonder of Nature. 2 Link to comment Share on other sites More sharing options...
joigus Posted May 10, 2021 Author Share Posted May 10, 2021 (edited) Where there's a will, there's a way. And even where there isn't exactly a will, there may still be a way. Edited May 10, 2021 by joigus 2 Link to comment Share on other sites More sharing options...
Curious layman Posted July 28, 2021 Share Posted July 28, 2021 (edited) really bad weather where I am, was gonna post something, but it's all going cock eyed. Apologies. Edited July 28, 2021 by Curious layman Link to comment Share on other sites More sharing options...
joigus Posted July 28, 2021 Author Share Posted July 28, 2021 1 hour ago, Curious layman said: really bad weather where I am, was gonna post something, but it's all going cock eyed. Apologies. Pitty. You have never disappointed. 👍 1 Link to comment Share on other sites More sharing options...
joigus Posted July 29, 2021 Author Share Posted July 29, 2021 12 hours ago, joigus said: Pitty. You have never disappointed. 👍 Pity even. Link to comment Share on other sites More sharing options...
beecee Posted July 30, 2021 Share Posted July 30, 2021 A mysterious Pink Lake can be found in Western Australia, Lake Hiller. It’s startling colour remains a mystery and while scientists have proven it’s not due to the algae, they still can’t explain while the lake is Pink. A stunning natural phenomena, worth a visit and a place on our bucket list.. from Wiki.... The vibrant colour is permanent, and does not alter when the water is taken in a container. The pink colour is believed to be due to the presence of the organism, Dunaliella salina.[4] The Extreme Microbiome Project, part of the Association of Biomolecular Resource Facilities (ABRF), Metagenomics Research Group (MGRG), has performed a metagenomic analysis on the lake to find Dunaliella as well as Salinibacter ruber, Dechloromonas aromatica, and a few species of the Archaea.[5] 1 Link to comment Share on other sites More sharing options...
joigus Posted July 30, 2021 Author Share Posted July 30, 2021 1 minute ago, beecee said: A mysterious Pink Lake can be found in Western Australia, Lake Hiller. It’s startling colour remains a mystery and while scientists have proven it’s not due to the algae, they still can’t explain while the lake is Pink. A stunning natural phenomena, worth a visit and a place on our bucket list.. from Wiki.... The vibrant colour is permanent, and does not alter when the water is taken in a container. The pink colour is believed to be due to the presence of the organism, Dunaliella salina.[4] The Extreme Microbiome Project, part of the Association of Biomolecular Resource Facilities (ABRF), Metagenomics Research Group (MGRG), has performed a metagenomic analysis on the lake to find Dunaliella as well as Salinibacter ruber, Dechloromonas aromatica, and a few species of the Archaea.[5] Ah, yes. I remember about this one. Nice. Link to comment Share on other sites More sharing options...
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