{"id":202067,"date":"2025-03-17T07:09:45","date_gmt":"2025-03-17T07:09:45","guid":{"rendered":"https:\/\/learnexams.com\/blog\/?p=202067"},"modified":"2025-03-17T07:09:48","modified_gmt":"2025-03-17T07:09:48","slug":"which-type-of-crustal-material-is-the-least-dense","status":"publish","type":"post","link":"https:\/\/www.learnexams.com\/blog\/2025\/03\/17\/which-type-of-crustal-material-is-the-least-dense\/","title":{"rendered":"Which type of crustal material is the least dense"},"content":{"rendered":"\n<p>Which type of crustal material is the least dense?<\/p>\n\n\n\n<p> a. Oceanic crust <\/p>\n\n\n\n<p>b. Continental crust<\/p>\n\n\n\n<p><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-ast-global-color-6-color\"><strong>The correct answer and explanation is :<\/strong><\/mark><\/p>\n\n\n\n<p>The correct answer is:<\/p>\n\n\n\n<p><strong>b. Continental crust<\/strong><\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Explanation:<\/h3>\n\n\n\n<p>The Earth&#8217;s crust is divided into two main types: <strong>oceanic crust<\/strong> and <strong>continental crust<\/strong>, each with distinct properties in terms of composition, thickness, and density.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\"><strong>Density Differences<\/strong><\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Oceanic crust<\/strong> is primarily composed of <strong>basalt<\/strong>, a dense and dark-colored volcanic rock rich in iron (Fe) and magnesium (Mg). Its density ranges from <strong>3.0 to 3.3 g\/cm\u00b3<\/strong>.<\/li>\n\n\n\n<li><strong>Continental crust<\/strong> is mainly made of <strong>granite<\/strong>, a lighter-colored rock that contains more silica (SiO\u2082) and aluminum (Al). Its density is <strong>lower<\/strong>, typically around <strong>2.7 to 2.8 g\/cm\u00b3<\/strong>.<\/li>\n<\/ul>\n\n\n\n<p>Because granite has a lower density than basalt, the continental crust is <strong>less dense<\/strong> than the oceanic crust.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\"><strong>Why Does Density Matter?<\/strong><\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li>The lower density of the continental crust causes it to &#8220;float&#8221; higher on the Earth&#8217;s mantle compared to the denser oceanic crust.<\/li>\n\n\n\n<li>This is why continents rise above sea level while oceanic crust forms the ocean floors.<\/li>\n\n\n\n<li>When oceanic and continental crusts collide (subduction zones), the denser oceanic crust is forced beneath the lighter continental crust, eventually sinking into the mantle and melting.<\/li>\n<\/ul>\n\n\n\n<h4 class=\"wp-block-heading\"><strong>Thickness and Composition<\/strong><\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Oceanic crust<\/strong> is thinner (5-10 km thick) but denser.<\/li>\n\n\n\n<li><strong>Continental crust<\/strong> is thicker (30-70 km thick) but less dense.<\/li>\n<\/ul>\n\n\n\n<p>In summary, <strong>continental crust is the least dense type of crustal material<\/strong>, which is why it forms the landmasses that rise above the oceans.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Which type of crustal material is the least dense? a. Oceanic crust b. Continental crust The correct answer and explanation is : The correct answer is: b. Continental crust Explanation: The Earth&#8217;s crust is divided into two main types: oceanic crust and continental crust, each with distinct properties in terms of composition, thickness, and density. [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","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":"","ast-disable-related-posts":"","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":"","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":[25],"tags":[],"class_list":["post-202067","post","type-post","status-publish","format-standard","hentry","category-exams-certification"],"_links":{"self":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts\/202067","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/comments?post=202067"}],"version-history":[{"count":0,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts\/202067\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/media?parent=202067"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/categories?post=202067"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/tags?post=202067"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}