{"id":14607,"date":"2022-04-05T22:00:27","date_gmt":"2022-04-05T20:00:27","guid":{"rendered":"https:\/\/serveiseducatius.xtec.cat\/cda-cansantoi\/?p=14607"},"modified":"2022-04-05T22:00:27","modified_gmt":"2022-04-05T20:00:27","slug":"les-escletxes-desvetllen-el-seu-origen","status":"publish","type":"post","link":"https:\/\/serveiseducatius.xtec.cat\/cda-cansantoi\/general\/les-escletxes-desvetllen-el-seu-origen\/","title":{"rendered":"Les Escletxes desvetllen el seu origen"},"content":{"rendered":"<p>Dimarts 5 d&#8217;abril l&#8217;alumnat de l&#8217;optativa CTMA de 2n de batxillerat de l&#8217;<a href=\"https:\/\/agora.xtec.cat\/insmartidot\/\" target=\"_blank\" rel=\"noopener\">Institut Mart\u00ed Dot<\/a> \u00a0de Sant Feliu de Llobregat ha anat a explorar <a href=\"https:\/\/serveiseducatius.xtec.cat\/cda-cansantoi\/ambits\/geologia\/les-escletxes-i-els-riscs-geologics\/\">Les Escletxes<\/a> del Papiol acompanyats pel <a href=\"https:\/\/serveiseducatius.xtec.cat\/cda-cansantoi\/\">Camp d&#8217;aprenentatge Can Santoi<\/a>.<\/p>\n<p>Conjuntament ens hem situat geogr\u00e0ficament i hem interpretat el relleu de la zona, observant dos tipus de materials i tamb\u00e9 l&#8217;orientaci\u00f3 del vessant. Per esbrinar l&#8217;origen de les Escletxes hem plantejat l&#8217;activitat com a una recerca basada en evid\u00e8ncies. Han sorgit dues hip\u00f2tesis: &#8220;les escletxes s&#8217;han originat a causa de fen\u00f2mens de meteoritzaci\u00f3&#8221; i &#8220;les escletxes s&#8217;han produ\u00eft per efecte de la tect\u00f2nica de plaques&#8221;.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-14612 alignleft\" src=\"https:\/\/serveiseducatius.xtec.cat\/cda-cansantoi\/wp-content\/uploads\/usu1385\/2022\/04\/IMG_20220405_172326-300x300.jpg\" alt=\"\" width=\"300\" height=\"300\" srcset=\"https:\/\/serveiseducatius.xtec.cat\/cda-cansantoi\/wp-content\/uploads\/usu1385\/2022\/04\/IMG_20220405_172326.jpg 300w, https:\/\/serveiseducatius.xtec.cat\/cda-cansantoi\/wp-content\/uploads\/usu1385\/2022\/04\/IMG_20220405_172326-150x150.jpg 150w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/>A partir d&#8217;aquestes hip\u00f2tesis han dedicat especial atenci\u00f3 a identificar les propietats dels materials sedimentaris inferiors, les argiles. Han comprovat la plasticitat en pres\u00e8ncia d&#8217;aigua. A continuaci\u00f3 han identificat els estrats superiors, formats per calc\u00e0ries fossil\u00edferes, que a escala micro s\u00f3n impermeables, per\u00f2 a escala meso i macro estan plens de forats i d&#8217;esquerdes verticals. Aquestes esquerdes s\u00ed que poden conduir les aig\u00fces pluvials cap als estrats inferiors argilosos.<\/p>\n<p>Despr\u00e9s d&#8217;una pausa per esmorzar s&#8217;han dedicat a obtenir mesures de 6 escletxes. Han esbrinat la direcci\u00f3, amplada, fond\u00e0ria, inclinacions de les parets i despla\u00e7aments verticals. Han obtingut que la majoria tenen una orientaci\u00f3 nord-sud, s&#8217;inclinen entre 80 i 90 graus i tenen obertures des de menys d&#8217;un metre a quasi 3 metres, amb fond\u00e0ries inferiors als 10 metres.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignright size-full wp-image-14613\" src=\"https:\/\/serveiseducatius.xtec.cat\/cda-cansantoi\/wp-content\/uploads\/usu1385\/2022\/04\/IMG_7600.jpg\" alt=\"\" width=\"225\" height=\"300\" \/>Amb tot el que han vist, han reelaborat la hip\u00f2tesis inicial dels\u00a0fen\u00f2mens erosius. La hist\u00f2ria m\u00e9s factible \u00e9s que els estrats calcaris, m\u00e9s r\u00edgids per\u00f2 amb fissures, han patit una meteoritzaci\u00f3 que ha perm\u00e8s a l&#8217;aigua de pluja fins arribar als estrats inferiors argilosos. Com que tot el conjunt es troba inclinat, el m\u00e9s probable \u00e9s que per gravetat els estrats calcaris s&#8217;hagin esberlat i lliscat sobre les argiles, produint aquest conjunt de grans esquerdes conegudes com les Escletxes.<\/p>\n<p>A la zona del voltant tamb\u00e9 han pogut observar el fenomen de reptaci\u00f3 evidenciat per la corba que presenten alguns pins. En acabar i de cam\u00ed cap el nucli urb\u00e0 hem pogut veure algunes afectacions als edificis per lliscament del substrat argil\u00f3s i han fet una valoraci\u00f3 del risc que suposa per les persones.<\/p>\n<p>Han gaudit d&#8217;una experi\u00e8ncia nova\u00a0 i han posat en pr\u00e0ctica els seus aprenentatges fora de l&#8217;aula.<\/p>\n<p>Felicitats per la recerca que heu completat!<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Dimarts 5 d&#8217;abril l&#8217;alumnat de l&#8217;optativa CTMA de 2n de batxillerat de l&#8217;Institut Mart\u00ed Dot \u00a0de Sant Feliu de Llobregat ha anat a explorar Les Escletxes del Papiol acompanyats pel Camp d&#8217;aprenentatge Can Santoi. Conjuntament ens hem situat geogr\u00e0ficament i hem interpretat el relleu de la zona, observant dos tipus de materials i tamb\u00e9 l&#8217;orientaci\u00f3 [&hellip;]<\/p>\n","protected":false},"author":3,"featured_media":14614,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_bbp_topic_count":0,"_bbp_reply_count":0,"_bbp_total_topic_count":0,"_bbp_total_reply_count":0,"_bbp_voice_count":0,"_bbp_anonymous_reply_count":0,"_bbp_topic_count_hidden":0,"_bbp_reply_count_hidden":0,"_bbp_forum_subforum_count":0,"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center 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