{"id":706,"date":"2014-11-10T12:48:08","date_gmt":"2014-11-10T11:48:08","guid":{"rendered":"http:\/\/www.lessvtdelagrenouille.fr\/blog\/?p=706"},"modified":"2014-11-16T15:33:58","modified_gmt":"2014-11-16T14:33:58","slug":"les-volcans","status":"publish","type":"post","link":"http:\/\/www.lessvtdelagrenouille.fr\/blog\/les-volcans\/","title":{"rendered":"Les volcans"},"content":{"rendered":"<p>Pour d\u00e9couvrir les volcans, nous allons en observer deux: Le Mont Ontake ( Japon qui est entr\u00e9 en\u00a0\u00e9ruption le 27 septembre 2014) et \u00a0l&rsquo;ETNA (sicile).<\/p>\n<table style=\"border: 0px solid #000000;\" border=\"0\">\n<tbody>\n<tr>\n<td><span style=\"color: #333333; font-family: Georgia, 'Times New Roman', 'Bitstream Charter', Times, serif; font-size: 14px; line-height: 21px;\"><span style=\"color: #333333; font-family: Georgia, 'Times New Roman', 'Bitstream Charter', Times, serif; font-size: 14px; line-height: 21px;\"><br \/>\n<\/span><\/span><\/p>\n<div style=\"position: relative; padding-bottom: 56.25%; padding-top: 25px; height: 0;\"><iframe loading=\"lazy\" style=\"border: 0; position: absolute; top: 0; left: 0; width: 100%; height: 100%;\" src=\"http:\/\/www.maxisciences.com\/embed\/7AvDyqMijhgCUMgpze-6wg\" height=\"240\" width=\"320\" allowfullscreen=\"true\"><\/iframe><\/div>\n<p><i>\u00a0<\/i><\/td>\n<td><\/td>\n<\/tr>\n<tr>\n<td>\u00a0<a href=\"http:\/\/www.maxisciences.com\/%e9ruption-volcanique\/mont-ontake-les-impressionnantes-images-de-l-039-eruption-du-volcan-japonais_art33555.html\" target=\"_blank\">Mont Ontake : les impressionnantes images de l&rsquo;\u00e9ruption du volcan japonais<\/a><\/td>\n<td><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p><span style=\"color: #ff0000;\"><b>I.\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/b><b>Observation de 2 volcans<\/b><\/span><\/p>\n<h3><span style=\"color: #339966;\">A. Observations<\/span><\/h3>\n<table style=\"border-color: #000000; border-width: 1px; background-color: #d1e9ee;\" border=\"1\">\n<tbody>\n<tr>\n<td><\/td>\n<td><strong>Volcan 1<\/strong><\/td>\n<td><strong>Volcan 2<\/strong><\/td>\n<\/tr>\n<tr>\n<td><strong>Nom<\/strong><\/td>\n<td>Le Mont Ontake<\/td>\n<td>L&rsquo;Etna<\/td>\n<\/tr>\n<tr>\n<td><strong>Localisation<\/strong><\/td>\n<td>Japon<\/td>\n<td>Sicile (sud de l&rsquo;Italie)<\/td>\n<\/tr>\n<tr>\n<td><strong>Manifestations<\/strong><\/td>\n<td>&#8211;\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 Nuage de cendre-\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 30 morts-\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 Pluie de pierre-\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 Pluie de ciment<\/td>\n<td>&#8211; Coul\u00e9e de lave- fum\u00e9e<\/td>\n<\/tr>\n<tr>\n<td><\/td>\n<td>\n<h3><strong><span style=\"color: #ff0000;\">Dangereux<\/span><\/strong><\/h3>\n<\/td>\n<td>\n<h3><strong><span style=\"color: #ff0000;\">Dangerosit\u00e9 limit\u00e9e<\/span><\/strong><\/h3>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p align=\"center\"><span style=\"color: #ff0000;\"><b>L\u2019Etna semble moins dangereux que le mont Ontake<\/b><\/span><\/p>\n<p><span style=\"color: #ff0000;\"><b>Il existe des volcans de type explosif ex\u00a0: mont Ontake, V\u00e9suve, montagne pel\u00e9e\u2026. Et des volcans effusifs ex\u00a0: Etna, piton de la fournaise\u2026<\/b><\/span><\/p>\n<h3><span style=\"color: #339966;\">B. Caract\u00e9ristiques<\/span><\/h3>\n<p><a href=\"http:\/\/www.lessvtdelagrenouille.fr\/blog\/wp-content\/uploads\/2014\/11\/sch\u00e9ma.png\"><img loading=\"lazy\" decoding=\"async\" alt=\"sch\u00e9ma\" src=\"http:\/\/www.lessvtdelagrenouille.fr\/blog\/wp-content\/uploads\/2014\/11\/sch\u00e9ma.png\" width=\"645\" height=\"199\" \/><\/a><\/p>\n<p><span style=\"color: #339966;\"><b>Comment expliquer le caract\u00e8re explosif ou effusif des\u00a0 volcans\u00a0?<\/b><\/span><\/p>\n<p><span style=\"color: #ff0000;\"><b>II. Origine des caract\u00e8res explosifs et effusif<\/b><\/span><\/p>\n<p><span style=\"color: #339966;\"><b>A. Des indices dans les roches<\/b><\/span><\/p>\n<table class=\"aligncenter\" style=\"background-color: #f50912; border: 1px solid #000000;\" border=\"1\">\n<tbody>\n<tr>\n<td><strong>Volcan effusif<\/strong><\/td>\n<td><img loading=\"lazy\" decoding=\"async\" class=\"alignnone\" alt=\"\" src=\"http:\/\/www.xena.ad\/lcf\/brian\/basalte\/dessinbasalte.gif\" width=\"237\" height=\"147\" \/><\/td>\n<td>Roche a\u00e9r\u00e9 avec des bulle de gaz<\/td>\n<\/tr>\n<tr>\n<td><strong>Volcan explosif<\/strong><\/td>\n<td><img loading=\"lazy\" decoding=\"async\" class=\"alignnone\" alt=\"\" src=\"https:\/\/encrypted-tbn1.gstatic.com\/images?q=tbn:ANd9GcQq35CzwVuVBvLx-7I_WqZOPXkG6Cbsq2ijrVFe91m7ehELHU23sg\" width=\"259\" height=\"194\" \/><\/td>\n<td style=\"text-align: center;\">Roche dense, compact<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p align=\"center\"><span style=\"color: #99cc00;\"><b>Comment expliquer le caract\u00e8re explosif ou effusif des\u00a0 volcans\u00a0?<\/b><\/span><\/p>\n<p style=\"text-align: left;\" align=\"center\"><span style=\"color: #339966;\"><b>B. Origine du comportement explosif<\/b><\/span><\/p>\n<p align=\"center\"><span style=\"color: #ff0000;\"><b>Magma\u00a0: mati\u00e8re min\u00e9ral en fusion constitu\u00e9 d\u2019un liquide contenant des \u00e9l\u00e9ments solides et des gaz<\/b><\/span><\/p>\n<p><span style=\"color: #ff0000;\"><b>Lave\u00a0= magma moins les gaz<\/b><\/span><\/p>\n<p><b>D\u00e9terminer des hypoth\u00e8ses\u00a0:<\/b><\/p>\n<p>&#8211;\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <b>Il y a plus de gaz<\/b><\/p>\n<p>&#8211;\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <b>Le magma est plus \u00e9pais<\/b><b><\/b><\/p>\n<p>Pour v\u00e9rifier ces hypoth\u00e8ses nous allons utiliser un mod\u00e8le<\/p>\n<table style=\"border: 1px solid #000000;\" border=\"1\">\n<tbody>\n<tr>\n<td><strong>Hypoth\u00e8se 1:<\/strong> la quantit\u00e9 de gaz diff\u00e9rente permet d&rsquo;expliquer le caract\u00e8re explosif ou effusif<\/td>\n<td><strong>Hypoth\u00e8se 2:<\/strong> L&rsquo;\u00e9paisseur du magmapermet d&rsquo;expliquer le caract\u00e8re explosif ou effusif<\/td>\n<\/tr>\n<tr>\n<td><\/td>\n<td><\/td>\n<\/tr>\n<tr>\n<td><\/td>\n<td><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>&nbsp;<\/p>\n<p><span style=\"color: #ff0000;\"><b>Bilan\u00a0: le caract\u00e8re explosif \/ effusif du volcan est du a la texture du magma. Plus le magma est visqueux plus il retient les gaz et plus le volcan explose<\/b><\/span><\/p>\n<p>L\u2019arriv\u00e9e en surface de certains magmas donne naissance \u00e0 des coul\u00e9es de lave, l\u2019arriv\u00e9e d\u2019autres magmas est caract\u00e9ris\u00e9e par des explosions projetant des mat\u00e9riaux.<\/p>\n<p><span style=\"color: #339966;\"><b>B\u00a0. Origine du magma<\/b><\/span><\/p>\n<p>&nbsp;<\/p>\n<p><a href=\"http:\/\/www.lessvtdelagrenouille.fr\/blog\/wp-content\/uploads\/2014\/11\/img183.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"alignleft  wp-image-744\" alt=\"img183\" src=\"http:\/\/www.lessvtdelagrenouille.fr\/blog\/wp-content\/uploads\/2014\/11\/img183.jpg\" width=\"737\" height=\"331\" srcset=\"http:\/\/www.lessvtdelagrenouille.fr\/blog\/wp-content\/uploads\/2014\/11\/img183.jpg 2047w, http:\/\/www.lessvtdelagrenouille.fr\/blog\/wp-content\/uploads\/2014\/11\/img183-300x134.jpg 300w, http:\/\/www.lessvtdelagrenouille.fr\/blog\/wp-content\/uploads\/2014\/11\/img183-1024x460.jpg 1024w\" sizes=\"auto, (max-width: 737px) 100vw, 737px\" \/><\/a><a href=\"http:\/\/www.lessvtdelagrenouille.fr\/blog\/wp-content\/uploads\/2014\/11\/sch\u00e9ma.png\"><br \/>\n<\/a><\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<ol>\n<li><strong>Expliquer la m\u00e9thode utilis\u00e9e pour \u00ab\u00a0voir\u00a0\u00bb une zone liquide sous la surface de la terre<\/strong><\/li>\n<li><strong>Entourer en rouge, sur le document, la zone correspondant au r\u00e9servoir magmatique<\/strong><\/li>\n<\/ol>\n<p>Source\u00a0: Belin<\/p>\n<p><strong><span style=\"line-height: 1.5em; color: #ff0000;\">Les magmas sont contenus dans des r\u00e9servoirs magmatiques localis\u00e9s \u00e0 plusieurs kilom\u00e8tres de profondeur.<\/span><\/strong><\/p>\n<h1><span style=\"color: #ff0000;\">III. Localisation des volcans<\/span><\/h1>\n<h2><span style=\"color: #339966;\">A\u00a0.Cartographie des volcans<\/span><\/h2>\n<p><b>utilisation du logiciel Tectoglob (TICE)<\/b><\/p>\n<p><b><b>A l&rsquo;aide du tutoriel utiliser le logiciel afin de r<\/b>epr\u00e9senter sur la carte des s\u00e9ismes la localisation des volcans\u00a0<\/b><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignleft\" alt=\"\" src=\"http:\/\/svtsite.free.fr\/local\/cache-vignettes\/L300xH216\/4-1-1-3-Tectoglob-seismes--2538c.jpg\" width=\"300\" height=\"216\" \/><img loading=\"lazy\" decoding=\"async\" class=\"alignnone\" alt=\"\" src=\"http:\/\/artic.ac-besancon.fr\/svt\/act_ped\/svt_clg\/quatrieme\/tectoglob\/images\/tecto-volcans.gif\" width=\"360\" height=\"180\" \/><\/p>\n<p>&nbsp;<\/p>\n<h3><span style=\"color: #ff0000;\">Les volcans actifs sont r\u00e9partis en majorit\u00e9 en bordure de continent et\u00a0 le long des dorsales oc\u00e9aniques<\/span><\/h3>\n<h3><span style=\"color: #339966;\"><b>B<\/b>. La piton de la fournaise de La r\u00e9union<\/span><b> <\/b><\/h3>\n<a href=\"http:\/\/www.lessvtdelagrenouille.fr\/blog\/wp-content\/plugins\/pdfjs-viewer-arno\/web\/viewer.php?file=http:\/\/www.lessvtdelagrenouille.fr\/blog\/wp-content\/uploads\/2014\/11\/Un-volcan-sous-haute-surveillance.pdf&download=true&print=true\">Voir en plein \u00e9cran<\/a><br><iframe loading=\"lazy\" frameborder=\"0\" style=\"border-radius:10px;\" width=\"100%;\" max-width=\"800px;\" min-width=\"600px;\" height=\"500px;\" src=\"http:\/\/www.lessvtdelagrenouille.fr\/blog\/wp-content\/plugins\/pdfjs-viewer-arno\/web\/viewer.php?file=http:\/\/www.lessvtdelagrenouille.fr\/blog\/wp-content\/uploads\/2014\/11\/Un-volcan-sous-haute-surveillance.pdf&download=true&print=true\"><\/iframe> \n<h3><span style=\"color: #ff0000;\"><b>Le piton de la fournaise est un volcan actif isol\u00e9<\/b><\/span><\/h3>\n<h3><span style=\"color: #ff0000;\"><b>L\u2019Homme se prot\u00e8ge des volcans en r\u00e9alisant une pr\u00e9vision des \u00e9ruptions volcaniques fond\u00e9e sur la surveillance et la connaissance de chaque volcan et par l\u2019information et l\u2019\u00e9ducation des populations.<\/b><\/span><\/h3>\n<p style=\"text-align: center;\"><a href=\"http:\/\/www.lessvtdelagrenouille.fr\/blog\/?attachment_id=756\">Fiche pour apprendre son cours sur les \u00a0\u00a0volcans<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Pour d\u00e9couvrir les volcans, nous allons en observer deux: Le Mont Ontake ( Japon qui est entr\u00e9 en\u00a0\u00e9ruption le 27 septembre 2014) et \u00a0l&rsquo;ETNA (sicile). \u00a0 \u00a0Mont Ontake : les impressionnantes images de l&rsquo;\u00e9ruption du volcan japonais I.\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0Observation de 2 volcans A. Observations Volcan 1 Volcan 2 Nom Le Mont Ontake L&rsquo;Etna Localisation Japon Sicile &#8230; <a title=\"Les volcans\" class=\"read-more\" href=\"http:\/\/www.lessvtdelagrenouille.fr\/blog\/les-volcans\/\" aria-label=\"En savoir plus sur Les volcans\">Lire la suite&#8230;<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[30],"tags":[],"class_list":["post-706","post","type-post","status-publish","format-standard","hentry","category-decouverte"],"featured_image_urls_v2":{"full":"","thumbnail":"","medium":"","medium_large":"","large":"","1536x1536":"","2048x2048":""},"post_excerpt_stackable_v2":"<p>Pour d\u00e9couvrir les volcans, nous allons en observer deux: Le Mont Ontake ( Japon qui est entr\u00e9 en\u00a0\u00e9ruption le 27 septembre 2014) et \u00a0l&rsquo;ETNA (sicile). \u00a0 \u00a0Mont Ontake : les impressionnantes images de l&rsquo;\u00e9ruption du volcan japonais I.\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0Observation de 2 volcans A. Observations Volcan 1 Volcan 2 Nom Le Mont Ontake L&rsquo;Etna Localisation Japon Sicile (sud de l&rsquo;Italie) Manifestations &#8211;\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 Nuage de cendre-\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 30 morts-\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 Pluie de pierre-\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 Pluie de ciment &#8211; Coul\u00e9e de lave- fum\u00e9e Dangereux Dangerosit\u00e9 limit\u00e9e L\u2019Etna semble moins dangereux que le mont Ontake Il existe des volcans de type explosif ex\u00a0: mont Ontake, V\u00e9suve, montagne pel\u00e9e\u2026.\u2026<\/p>\n","category_list_v2":"<a href=\"http:\/\/www.lessvtdelagrenouille.fr\/blog\/category\/decouverte\/\" rel=\"category tag\">D\u00e9couverte<\/a>","author_info_v2":{"name":"RolandC","url":"http:\/\/www.lessvtdelagrenouille.fr\/blog\/author\/rollandc\/"},"comments_num_v2":"0 commentaire","_links":{"self":[{"href":"http:\/\/www.lessvtdelagrenouille.fr\/blog\/wp-json\/wp\/v2\/posts\/706","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/www.lessvtdelagrenouille.fr\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/www.lessvtdelagrenouille.fr\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/www.lessvtdelagrenouille.fr\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/www.lessvtdelagrenouille.fr\/blog\/wp-json\/wp\/v2\/comments?post=706"}],"version-history":[{"count":9,"href":"http:\/\/www.lessvtdelagrenouille.fr\/blog\/wp-json\/wp\/v2\/posts\/706\/revisions"}],"predecessor-version":[{"id":760,"href":"http:\/\/www.lessvtdelagrenouille.fr\/blog\/wp-json\/wp\/v2\/posts\/706\/revisions\/760"}],"wp:attachment":[{"href":"http:\/\/www.lessvtdelagrenouille.fr\/blog\/wp-json\/wp\/v2\/media?parent=706"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.lessvtdelagrenouille.fr\/blog\/wp-json\/wp\/v2\/categories?post=706"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.lessvtdelagrenouille.fr\/blog\/wp-json\/wp\/v2\/tags?post=706"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}