{"id":1958,"date":"2016-12-18T10:00:40","date_gmt":"2016-12-18T10:00:40","guid":{"rendered":"https:\/\/blogs.futura-sciences.com\/bardintzeff\/?p=1958"},"modified":"2016-12-18T10:07:01","modified_gmt":"2016-12-18T10:07:01","slug":"cascade-detufs","status":"publish","type":"post","link":"https:\/\/blogs.futura-sciences.com\/bardintzeff\/2016\/12\/18\/cascade-detufs\/","title":{"rendered":"Cascade d\u2019\u00c9tufs"},"content":{"rendered":"<p>La cascade d\u2019\u00c9tufs se situe \u00e0 Rouvres-sur-Aube (52160) en Haute-Marne, entre Langres et Ch\u00e2tillon-sur-Seine. Il s\u2019agit d\u2019une source p\u00e9trifiante qui a d\u00e9pos\u00e9 une roche calcaire poreuse appel\u00e9e \u201etuf\u201c en plusieurs terrasses.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone  wp-image-1960\" src=\"https:\/\/blogs.futura-sciences.com\/bardintzeff\/wp-content\/uploads\/sites\/3\/2016\/12\/Bardintzeff.2010.12.Etufs_.s-450x300.jpg\" alt=\"bardintzeff-2010-12-etufs-s\" width=\"590\" height=\"393\" srcset=\"https:\/\/blogs.futura-sciences.com\/bardintzeff\/wp-content\/uploads\/sites\/3\/2016\/12\/Bardintzeff.2010.12.Etufs_.s-450x300.jpg 450w, https:\/\/blogs.futura-sciences.com\/bardintzeff\/wp-content\/uploads\/sites\/3\/2016\/12\/Bardintzeff.2010.12.Etufs_.s-768x512.jpg 768w, https:\/\/blogs.futura-sciences.com\/bardintzeff\/wp-content\/uploads\/sites\/3\/2016\/12\/Bardintzeff.2010.12.Etufs_.s-1024x683.jpg 1024w, https:\/\/blogs.futura-sciences.com\/bardintzeff\/wp-content\/uploads\/sites\/3\/2016\/12\/Bardintzeff.2010.12.Etufs_.s.jpg 1134w\" sizes=\"auto, (max-width: 590px) 100vw, 590px\" \/>La Cascade d\u2019\u00c9tufs (\u00a9 J.M. Bardintzeff).<\/p>\n<p><!--more-->Le calcaire (carbonate de calcium, CaCO<sub>3<\/sub>) dissous dans l\u2019eau (H<sub>2<\/sub>O) peut se solidifier (pr\u00e9cipiter) dans certaines conditions.<\/p>\n<p>Et voici, pour les passionn\u00e9s (et pour mes \u00e9tudiants\u00a0!), l\u2019\u00e9quation de l\u2019\u00e9quilibre chimique\u00a0:<\/p>\n<p>Ca<sup>++<\/sup> + 2 HCO<sub>3<\/sub><sup>&#8211;<\/sup> &lt;-&gt; CaCO<sub>3<\/sub> + H<sub>2<\/sub>O + CO<sub>2<\/sub><\/p>\n<!-- AddThis Advanced Settings generic via filter on the_content --><!-- AddThis Share Buttons generic via filter on the_content -->","protected":false},"excerpt":{"rendered":"<p>La cascade d\u2019\u00c9tufs se situe \u00e0 Rouvres-sur-Aube (52160) en Haute-Marne, entre Langres et Ch\u00e2tillon-sur-Seine. Il s\u2019agit d\u2019une source p\u00e9trifiante qui a d\u00e9pos\u00e9 une roche calcaire poreuse appel\u00e9e \u201etuf\u201c en plusieurs terrasses. La Cascade d\u2019\u00c9tufs (\u00a9 J.M. Bardintzeff).<!-- AddThis Advanced Settings generic via filter on get_the_excerpt --><!-- AddThis Share Buttons generic via filter on get_the_excerpt --><\/p>\n","protected":false},"author":3,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[8],"tags":[639,662,663,664,438,665],"class_list":["post-1958","post","type-post","status-publish","format-standard","hentry","category-voyages","tag-calcaire","tag-cascade-detufs","tag-etufs","tag-rouvres-sur-aube","tag-source-petrifiante","tag-tuf"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.1 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Cascade d\u2019\u00c9tufs, par Jacques-Marie Bardintzeff<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/blogs.futura-sciences.com\/bardintzeff\/2016\/12\/18\/cascade-detufs\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Cascade d\u2019\u00c9tufs, par Jacques-Marie Bardintzeff\" \/>\n<meta property=\"og:description\" content=\"La cascade d\u2019\u00c9tufs se situe \u00e0 Rouvres-sur-Aube (52160) en Haute-Marne, entre Langres et Ch\u00e2tillon-sur-Seine. Il s\u2019agit d\u2019une source p\u00e9trifiante qui a d\u00e9pos\u00e9 une roche calcaire poreuse appel\u00e9e \u201etuf\u201c en plusieurs terrasses. La Cascade d\u2019\u00c9tufs (\u00a9 J.M. 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