{"id":9887,"date":"2018-06-07T10:16:49","date_gmt":"2018-06-07T08:16:49","guid":{"rendered":"http:\/\/agora.xtec.cat\/iesm-jmzafra\/?p=9887"},"modified":"2018-06-07T10:16:49","modified_gmt":"2018-06-07T08:16:49","slug":"creta","status":"publish","type":"post","link":"https:\/\/agora.xtec.cat\/inscaterinaalbert\/blogs\/museu-de-geologia\/creta\/","title":{"rendered":"CRETA"},"content":{"rendered":"

Nom:<\/strong>
\nCatal\u00e0: Creta<\/strong>
\nCastell\u00e0: Creta
\nAngles: Chalk
\nFranc\u00e8s: Craie
\nImatges:<\/strong><\/p>\n

\"Resultat<\/p>\n

Quin tipus i subtipus de roca i\/o mineral \u00e9s?<\/strong><\/p>\n

Es una roca sedimentaria i calc\u00e0ria<\/p>\n

Formaci\u00f3 de la roca i\/o mineral<\/strong>
\nEs forma sota condicions marines profundes per l’acumulaci\u00f3 gradual de petites plaques de calcita (cocc\u00f2lits), posades per microorganismes anomenats coccolitoforal<\/p>\n

Composici\u00f3 qu\u00edmica:<\/strong>
\nEst\u00e0 compost per carbonat de calci o CaCO3 .<\/p>\n

Breu descripci\u00f3 (color, textura…)<\/strong>
\nLa roca Creta es blanca , amb pols i tova. T\u00e9 una forma calc\u00e0ria .Resisteix m\u00e9s la meteoritzaci\u00f3 que l’argila amb la qual normalment est\u00e0 associada, format aix\u00ed penya-segats als litorals. La creta, per la seva porositat, olla acumular molta aigua i alliberar-la en els estacions seques.<\/p>\n

Usos i\/o aplicacions<\/strong>
\nLa creta s’utilitza per fer el guix per escriure o dibuixar en superf\u00edcies rugoses. En agricultura s’utilitza per elevar el pH dels s\u00f2ls \u00e0cids. En esports com el tennis s’utilitza per marcar els l\u00edmits del terreny de joc per\u00f2 actualment s’utilitza m\u00e9s el di\u00f2xid de titani. En gimn\u00e0stica tradicionalment s’utilitzava la creta per a les mans, actualment s’utilitza per\u00f2, el carbonat de magnesi. La creta pot ser un ingredient de la pasta dent\u00edfrica, tamb\u00e9 en el polit de metalls.<\/p>\n

Lloc d’origen (Jaciments m\u00e9s importants)<\/strong>
\n\u00c9s una roca que s\u2019ha format en ambient aqu\u00e0tic, per acumulaci\u00f3 en el fons del mar de caparrons
\nPenya-segats de Dover ( Regne Unit), \u00abel penya-segat, que arriba fins a 106 metres d’altura, deu el seu cridanera fa\u00e7ana a la seva composici\u00f3 de creta\u00bb.<\/p>\n

Refer\u00e8ncia bibliogr\u00e0fica<\/strong>
\nhttps:\/\/ca.wikipedia.org\/wiki\/Creta_(geologia)
\nhttps:\/\/ca.wikipedia.org\/wiki\/Llista_de_roques_sediment%C3%A0ries
\nhttps:\/\/www.ecured.cu\/index.php?search=+roca+creta&button=<\/p>\n","protected":false},"excerpt":{"rendered":"

Nom: Catal\u00e0: Creta Castell\u00e0: Creta Angles: Chalk Franc\u00e8s: Craie Imatges: Quin tipus i subtipus de roca i\/o mineral \u00e9s? Es una roca sedimentaria i calc\u00e0ria Formaci\u00f3 de la roca i\/o mineral Es forma sota condicions marines profundes per l’acumulaci\u00f3 gradual de petites plaques de calcita (cocc\u00f2lits), posades per microorganismes anomenats coccolitoforal Composici\u00f3 qu\u00edmica: Est\u00e0 compost […]<\/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":[321],"tags":[],"class_list":["post-9887","post","type-post","status-publish","format-standard","hentry","category-museu-de-geologia"],"post_mailing_queue_ids":[],"_links":{"self":[{"href":"https:\/\/agora.xtec.cat\/inscaterinaalbert\/wp-json\/wp\/v2\/posts\/9887","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=9887"}],"version-history":[{"count":4,"href":"https:\/\/agora.xtec.cat\/inscaterinaalbert\/wp-json\/wp\/v2\/posts\/9887\/revisions"}],"predecessor-version":[{"id":9912,"href":"https:\/\/agora.xtec.cat\/inscaterinaalbert\/wp-json\/wp\/v2\/posts\/9887\/revisions\/9912"}],"wp:attachment":[{"href":"https:\/\/agora.xtec.cat\/inscaterinaalbert\/wp-json\/wp\/v2\/media?parent=9887"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/agora.xtec.cat\/inscaterinaalbert\/wp-json\/wp\/v2\/categories?post=9887"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/agora.xtec.cat\/inscaterinaalbert\/wp-json\/wp\/v2\/tags?post=9887"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}