{"id":3817,"date":"2017-04-28T11:37:40","date_gmt":"2017-04-28T09:37:40","guid":{"rendered":"http:\/\/agora.xtec.cat\/iesm-jmzafra\/?p=3817"},"modified":"2018-06-07T10:52:56","modified_gmt":"2018-06-07T08:52:56","slug":"creta-blanca-2","status":"publish","type":"post","link":"https:\/\/agora.xtec.cat\/inscaterinaalbert\/general\/creta-blanca-2\/","title":{"rendered":"CRETA BLANCA"},"content":{"rendered":"

Nom<\/strong>
\nCatal\u00e0: Creta blanca<\/strong>
\nCastell\u00e0: Creta blanca
\nAngl\u00e8s: Chalk
\nFranc\u00e8s: Craie blanche<\/p>\n

Imatges<\/strong><\/p>\n

\"Resultat<\/p>\n

Quin tipus i subtipus de roca i\/o mineral \u00e9s?<\/strong>
\nLa creta \u00e9s una roca seduiment\u00e0ruia, un tipus de pedra calc\u00e0ruia.
\nRoca sediment\u00e0ria: una roca sediment\u00e0ria \u00e9s aquella que es forma per l\u2019acumulaci\u00f3 de sediments (material s\u00f2lid acumulat superf\u00edcie terrestre).
\nPedra calc\u00e0ria: les roques calc\u00e0ries s\u00f3n roques sediment\u00e0ries que estan formades (m\u00e9s del 50%) per carbonat de calci.<\/p>\n

Formaci\u00f3 de la roca i\/o mineral<\/strong>
\nLa creta es forma sota condicions marines profundes degut a l\u2019acumulaci\u00f3 de petites plaques de calcita (cocc\u00f2lits).
\n\u00c9s com\u00fa trobar n\u00f2duls de chert o s\u00edlex embeguts en la creta.<\/p>\n

Composici\u00f3 qu\u00edmica<\/strong>
\n\u2022 Carbonat de calci (CaCO3): 100,00%
\nF\u00f3rmula qu\u00edmica: CaCO3<\/p>\n

Breu descripci\u00f3 (color, textura.)<\/strong>
\nLa creta \u00e9s una roca blanca i porosa, de gra fi de color blanquin\u00f3s. T\u00e9 una textura m\u00e9s o menys rugosa, i, al estar formada per carbonat de calci, \u00e9s una pedra bastant tova que es desf\u00e0 f\u00e0cilment. La ratlla que deixar\u00e0 si ratllem en una paret (per exemple) ser\u00e0 blanca.<\/p>\n

Usos i\/o aplicacions<\/strong><\/p>\n

L\u2019\u00fas m\u00e9s com\u00fa per aquest tipus de roca \u00e9s per a fabricar els guixos de les pissarres o per a\u00a0<\/span>dibuixar en superf\u00edcies rugoses. Tamb\u00e9 es fa servir per crear la cal\u00e7 viva (\u00f2xid de calci: CaO) i la\u00a0<\/span>cal\u00e7 apagada (hidr\u00f2xid de calci: Ca(OH)2).<\/span><\/p>\n

Lloc d’origen (jaciments m\u00e9s importants)<\/strong>
\nEls jaciments m\u00e9s importants es troben a:
\n\u2022 Estats Units (Arkansas, Iowa i Texas)
\n\u2022 Gran Bretanya (penya-segats de Dover)
\n\u2022 Gr\u00e8cia (Creta)<\/p>\n

Refer\u00e8ncia bibliogr\u00e0fica<\/strong>
\nhtps:\/\/ca.wikipedia.org\/wiki\/Creta_(geologia)
\nhtps:\/\/agora.xtec.cat\/iesm-jmzafra\/blogs\/museu-de-geologia\/creta-blanca\/
\nhtp:\/\/trazoautodidacta.blogspot.com\/2014\/06\/la-creta.html
\nhtp:\/\/www.todacultura.com\/glosarioceramica\/creta.htm<\/p>\n","protected":false},"excerpt":{"rendered":"

Nom Catal\u00e0: Creta blanca Castell\u00e0: Creta blanca Angl\u00e8s: Chalk Franc\u00e8s: Craie blanche Imatges Quin tipus i subtipus de roca i\/o mineral \u00e9s? La creta \u00e9s una roca seduiment\u00e0ruia, un tipus de pedra calc\u00e0ruia. Roca sediment\u00e0ria: una roca sediment\u00e0ria \u00e9s aquella que es forma per l\u2019acumulaci\u00f3 de sediments (material s\u00f2lid acumulat superf\u00edcie terrestre). Pedra calc\u00e0ria: les […]<\/p>\n","protected":false},"author":185,"featured_media":0,"comment_status":"closed","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 center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[1,321],"tags":[],"class_list":["post-3817","post","type-post","status-publish","format-standard","hentry","category-general","category-museu-de-geologia"],"post_mailing_queue_ids":[],"_links":{"self":[{"href":"https:\/\/agora.xtec.cat\/inscaterinaalbert\/wp-json\/wp\/v2\/posts\/3817","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/agora.xtec.cat\/inscaterinaalbert\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/agora.xtec.cat\/inscaterinaalbert\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/agora.xtec.cat\/inscaterinaalbert\/wp-json\/wp\/v2\/users\/185"}],"replies":[{"embeddable":true,"href":"https:\/\/agora.xtec.cat\/inscaterinaalbert\/wp-json\/wp\/v2\/comments?post=3817"}],"version-history":[{"count":3,"href":"https:\/\/agora.xtec.cat\/inscaterinaalbert\/wp-json\/wp\/v2\/posts\/3817\/revisions"}],"predecessor-version":[{"id":9926,"href":"https:\/\/agora.xtec.cat\/inscaterinaalbert\/wp-json\/wp\/v2\/posts\/3817\/revisions\/9926"}],"wp:attachment":[{"href":"https:\/\/agora.xtec.cat\/inscaterinaalbert\/wp-json\/wp\/v2\/media?parent=3817"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/agora.xtec.cat\/inscaterinaalbert\/wp-json\/wp\/v2\/categories?post=3817"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/agora.xtec.cat\/inscaterinaalbert\/wp-json\/wp\/v2\/tags?post=3817"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}