{"id":234173,"date":"2025-06-13T19:31:24","date_gmt":"2025-06-13T19:31:24","guid":{"rendered":"https:\/\/learnexams.com\/blog\/?p=234173"},"modified":"2025-06-13T19:31:26","modified_gmt":"2025-06-13T19:31:26","slug":"what-is-the-second-most-abundant-gas-in-our-atmosphere","status":"publish","type":"post","link":"https:\/\/www.learnexams.com\/blog\/2025\/06\/13\/what-is-the-second-most-abundant-gas-in-our-atmosphere\/","title":{"rendered":"what is the second most abundant gas in our atmosphere"},"content":{"rendered":"\n<p>what is the second most abundant gas in our atmosphere<\/p>\n\n\n\n<p><strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-ast-global-color-0-color\">The Correct Answer and Explanation is:<\/mark><\/strong><\/p>\n\n\n\n<p><strong>Correct Answer:<\/strong><br>The second most abundant gas in our atmosphere is <strong>oxygen (O\u2082).<\/strong><\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">Explanation:<\/h3>\n\n\n\n<p>The Earth&#8217;s atmosphere is composed of a mixture of gases, most of which are essential for life and the planet&#8217;s climate. The two most abundant gases are <strong>nitrogen<\/strong> and <strong>oxygen<\/strong>.<\/p>\n\n\n\n<p><strong>Nitrogen<\/strong> is the most abundant gas, making up approximately <strong>78%<\/strong> of the atmosphere by volume. It is a relatively inert gas and does not easily react with other substances under normal conditions. This stability makes nitrogen a crucial part of the atmosphere, providing a buffer that prevents rapid combustion and helps maintain a stable environment.<\/p>\n\n\n\n<p><strong>Oxygen<\/strong>, the second most abundant gas, accounts for about <strong>21%<\/strong> of the atmosphere. Oxygen is highly reactive and plays a vital role in many biological and chemical processes. It is essential for <strong>respiration<\/strong> in animals and humans, allowing cells to produce energy. Plants, algae, and some bacteria produce oxygen as a byproduct of <strong>photosynthesis<\/strong>, a process that converts carbon dioxide and sunlight into energy.<\/p>\n\n\n\n<p>Although oxygen is less abundant than nitrogen, it is more chemically active. It supports <strong>combustion<\/strong>, which is why fires cannot burn without it. It also combines with other elements to form oxides and plays a role in the formation of the ozone layer (O\u2083), which protects Earth from harmful ultraviolet radiation.<\/p>\n\n\n\n<p>The remaining 1% of the atmosphere is made up of <strong>argon (0.93%)<\/strong>, <strong>carbon dioxide (around 0.04%)<\/strong>, <strong>neon<\/strong>, <strong>helium<\/strong>, <strong>methane<\/strong>, <strong>krypton<\/strong>, <strong>hydrogen<\/strong>, and <strong>water vapor<\/strong> (which varies depending on location and climate).<\/p>\n\n\n\n<p>In summary, oxygen is the <strong>second most abundant<\/strong> gas in Earth\u2019s atmosphere and plays a crucial role in supporting life and enabling many natural processes that sustain the environment.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" src=\"https:\/\/learnexams.com\/blog\/wp-content\/uploads\/2025\/06\/learnexams-banner5-485.jpeg\" alt=\"\" class=\"wp-image-234174\"\/><\/figure>\n","protected":false},"excerpt":{"rendered":"<p>what is the second most abundant gas in our atmosphere The Correct Answer and Explanation is: Correct Answer:The second most abundant gas in our atmosphere is oxygen (O\u2082). Explanation: The Earth&#8217;s atmosphere is composed of a mixture of gases, most of which are essential for life and the planet&#8217;s climate. The two most abundant gases [&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-234173","post","type-post","status-publish","format-standard","hentry","category-exams-certification"],"_links":{"self":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts\/234173","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=234173"}],"version-history":[{"count":0,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts\/234173\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/media?parent=234173"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/categories?post=234173"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/tags?post=234173"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}