{"id":213958,"date":"2025-03-23T12:37:00","date_gmt":"2025-03-23T07:07:00","guid":{"rendered":"https:\/\/www.oliveboard.in\/blog\/?p=213958"},"modified":"2025-03-24T10:43:15","modified_gmt":"2025-03-24T05:13:15","slug":"structure-and-composition-of-atmosphere","status":"publish","type":"post","link":"https:\/\/www.oliveboard.in\/blog\/structure-and-composition-of-atmosphere\/","title":{"rendered":"Structure and Composition of Atmosphere &#8211; UGC NET Geography Notes"},"content":{"rendered":"<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_77 counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">Table of content<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Content\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 eztoc-toggle-hide-by-default' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/www.oliveboard.in\/blog\/structure-and-composition-of-atmosphere\/#Composition_of_Atmosphere\" >Composition of Atmosphere<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/www.oliveboard.in\/blog\/structure-and-composition-of-atmosphere\/#Structure_of_Atmosphere\" >Structure of Atmosphere<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/www.oliveboard.in\/blog\/structure-and-composition-of-atmosphere\/#Importance_of_Atmospheric_Composition\" >Importance of Atmospheric Composition<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/www.oliveboard.in\/blog\/structure-and-composition-of-atmosphere\/#Conclusion\" >Conclusion<\/a><\/li><\/ul><\/nav><\/div>\n\n<p><strong>Structure and Composition of Atmosphere:<\/strong> The <strong>composition of atmosphere <\/strong>plays a crucial role in sustaining life on Earth, regulating climate, and influencing weather patterns. The <strong>Earth&#8217;s atmosphere<\/strong> is a complex mixture of gases, particles, and water vapor, forming distinct layers based on temperature variations. Understanding the <strong>structure and composition of atmosphere<\/strong> is essential for grasping concepts related to meteorology, environmental science, and climate change. This article explores the<strong> key components of the atmosphere,<\/strong> its layered structure, and the significance of each element in maintaining Earth&#8217;s ecological balance. Every year a handful of question is asked from this topic in <strong>UGC NET Geography exam.<\/strong><\/p>\n\n\n\n<div class=\"wp-block-buttons is-content-justification-center is-layout-flex wp-container-core-buttons-is-layout-16018d1d wp-block-buttons-is-layout-flex\">\n<div class=\"wp-block-button\"><a class=\"wp-block-button__link\" href=\"https:\/\/www.oliveboard.in\/ugc-net-mock-test\/?ref=contstuti-ugc-net\" target=\"_blank\" rel=\"noreferrer noopener\">Attempt UGC NET Mock Test 2025<\/a><\/div>\n<\/div>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Composition_of_Atmosphere\"><\/span>Composition of Atmosphere<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>The<strong> composition of atmosphere<\/strong> refers to the mixture of gases, water vapor, and aerosols that surround the Earth. Understanding its composition is essential for climatology, meteorology, and competitive exams like <strong>UGC NET Geography.<\/strong><\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Major Gases in the Atmosphere<\/h3>\n\n\n\n<p>The Earth&#8217;s atmosphere is composed of several gases, with Nitrogen and Oxygen being the most abundant.<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table><tbody><tr><td><strong>Gas<\/strong><\/td><td><strong>Percentage<\/strong><\/td><td><strong>Significance<\/strong><\/td><\/tr><tr><td><strong>Nitrogen (N\u2082)<\/strong><\/td><td>78.08%<\/td><td>Essential for the nitrogen cycle, supports plant growth.<\/td><\/tr><tr><td><strong>Oxygen (O\u2082)<\/strong><\/td><td>20.95%<\/td><td>Supports respiration and combustion.<\/td><\/tr><tr><td><strong>Argon (Ar)<\/strong><\/td><td>0.93%<\/td><td>Inert gas with minimal atmospheric effects.<\/td><\/tr><tr><td><strong>Carbon Dioxide (CO\u2082)<\/strong><\/td><td>0.04%<\/td><td>Vital for photosynthesis, major greenhouse gas.<\/td><\/tr><tr><td><strong>Other Gases (Neon, Helium, Methane, Krypton, Hydrogen, Ozone)<\/strong><\/td><td>Very Less amounts<\/td><td>Contribute to climate regulation, ozone formation, and greenhouse effects.<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\">Water Vapor and Aerosols<\/h3>\n\n\n\n<ul class=\"wp-block-list\"><li><strong>Water Vapor (0-4%):<\/strong> Varies by region, plays a crucial role in the hydrological cycle, affects humidity, cloud formation, and precipitation.<\/li><li><strong>Aerosols:<\/strong> Tiny particles (dust, pollen, soot, salt) suspended in the air, impacting cloud formation and climate regulation.<\/li><\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Significance of Atmospheric Composition<\/h3>\n\n\n\n<ul class=\"wp-block-list\"><li><strong>Maintains Life: <\/strong>Oxygen is essential for respiration, and CO\u2082 is vital for photosynthesis.<\/li><li><strong>Regulates Temperature:<\/strong> Greenhouse gases like CO\u2082 and water vapor trap heat, maintaining Earth\u2019s climate.<\/li><li><strong>Protects from UV Radiation: <\/strong>The ozone layer in the stratosphere absorbs harmful ultraviolet rays.<\/li><li><strong>Drives Weather and Climate: <\/strong>Atmospheric gases and water vapor influence wind patterns, monsoons, and precipitation cycles.<\/li><\/ul>\n\n\n\n<p><strong>Also Check: <a href=\"https:\/\/www.oliveboard.in\/blog\/geomorphology-notes-for-ugc-net\/\" target=\"_blank\" rel=\"noreferrer noopener\">Geomorphology Notes for UGC NET<\/a><\/strong><\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Structure_of_Atmosphere\"><\/span>Structure of Atmosphere<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>The <strong>Earth&#8217;s atmosphere <\/strong>is divided into five distinct layers based on temperature variations. Each layer has unique characteristics and plays a crucial role in regulating climate, protecting life, and enabling atmospheric processes.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Five Atmospheric Layers Based on Temperature Variations<\/h3>\n\n\n\n<h3 class=\"wp-block-heading\">1. Troposphere (0-12 km)<\/h3>\n\n\n\n<ul class=\"wp-block-list\"><li><strong>Weather Formation: <\/strong>All weather phenomena like clouds, storms, and rainfall occur here.<\/li><li><strong>Temperature Lapse Rate:<\/strong> Temperature decreases with altitude at -6.5\u00b0C per km.<\/li><li><strong>Jet Streams:<\/strong> High-speed winds located near the tropopause, influencing global weather patterns.<\/li><li><strong>Highest Atmospheric Density:<\/strong> Contains 75% of the total atmospheric mass and almost all water vapor.<\/li><\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">2. Stratosphere (12-50 km)<\/h3>\n\n\n\n<ul class=\"wp-block-list\"><li><strong>Ozone Layer: <\/strong>Located between 15-35 km, absorbs harmful UV radiation.<\/li><li><strong>Stable Air Conditions: <\/strong>Favorable for jet aircraft flights due to minimal turbulence.<\/li><li><strong>Temperature Increase: <\/strong>Unlike the troposphere, temperature increases with altitude due to ozone absorption of solar radiation.<\/li><\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">3. Mesosphere (50-80 km)<\/h3>\n\n\n\n<ul class=\"wp-block-list\"><li><strong>Coldest Layer: <\/strong>Temperatures drop as low as -90\u00b0C.<\/li><li><strong>Meteor Burns: <\/strong>Most meteors disintegrate in this layer due to high friction.<\/li><li><strong>Noctilucent Clouds: <\/strong>Rare, high-altitude ice crystal clouds visible during twilight.<\/li><\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">4. Thermosphere (80-700 km)<\/h3>\n\n\n\n<ul class=\"wp-block-list\"><li><strong>Auroras:<\/strong> Northern and Southern Lights occur due to charged particles interacting with Earth\u2019s magnetic field.<\/li><li><strong>Ionosphere<\/strong> contains ionized gases, facilitating radio wave transmission and communication signals.<\/li><li><strong>Extreme Temperatures: <\/strong>Can reach 2000\u00b0C or more due to direct solar radiation absorption.<\/li><\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">5. Exosphere (700 km and beyond)<\/h3>\n\n\n\n<ul class=\"wp-block-list\"><li><strong>Outer Boundary:<\/strong> Merges gradually into outer space.<\/li><li><strong>Satellite Orbits:<\/strong> Most artificial satellites, including GPS and communication satellites, orbit in this region.<\/li><li><strong>Thin Atmosphere: <\/strong>Composed mainly of hydrogen and helium, with particles moving freely.<\/li><\/ul>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Importance_of_Atmospheric_Composition\"><\/span>Importance of Atmospheric Composition<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>The <strong>composition of atmosphere<\/strong> is crucial for sustaining life, regulating climate, and supporting various natural and human activities. <strong>Here are its importance:<\/strong><\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Supports Life on Earth<\/h4>\n\n\n\n<ul class=\"wp-block-list\"><li><strong>Oxygen (21%): <\/strong>Essential for respiration in humans and animals.<\/li><li><strong>Carbon Dioxide (0.04%): <\/strong>Required for photosynthesis in plants.<\/li><li><strong>Nitrogen (78%):<\/strong> Helps in the nitrogen cycle, supporting plant growth.<\/li><\/ul>\n\n\n\n<h4 class=\"wp-block-heading\">Regulates Earth&#8217;s Temperature<\/h4>\n\n\n\n<ul class=\"wp-block-list\"><li><strong>Greenhouse Gases (CO\u2082, Methane, Water Vapor, Ozone)<\/strong> trap heat and maintain Earth\u2019s temperature.<\/li><li>Prevents extreme temperature fluctuations between day and night.<\/li><\/ul>\n\n\n\n<h4 class=\"wp-block-heading\">Protects from Harmful Solar Radiation<\/h4>\n\n\n\n<ul class=\"wp-block-list\"><li><strong>Ozone Layer (O\u2083) <\/strong>in the stratosphere absorbs harmful <strong>ultraviolet (UV) rays<\/strong>, preventing skin cancer and other harmful effects.<\/li><\/ul>\n\n\n\n<h4 class=\"wp-block-heading\">Enables Weather and Climate Patterns<\/h4>\n\n\n\n<ul class=\"wp-block-list\"><li><strong>Water Vapor (0-4%)<\/strong> influences humidity, cloud formation, and precipitation.<\/li><li><strong>Atmospheric circulation <\/strong>patterns determine monsoons, winds, and storms.<\/li><\/ul>\n\n\n\n<h4 class=\"wp-block-heading\">Supports Communication and Aviation<\/h4>\n\n\n\n<ul class=\"wp-block-list\"><li><strong>Ionosphere (in the Thermosphere)<\/strong> helps in radio signal transmission.<\/li><li>Airplanes fly in the stratosphere to avoid turbulence.<\/li><\/ul>\n\n\n\n<h4 class=\"wp-block-heading\">Essential for Human Activities<\/h4>\n\n\n\n<ul class=\"wp-block-list\"><li>Provides oxygen for breathing, carbon dioxide for plants, and nitrogen for agriculture.<\/li><li>Helps in industrial processes like <strong>refrigeration (Argon, CO\u2082), welding (Helium), <\/strong>and <strong>medical applications (O\u2082, Nitrous Oxide).<\/strong><\/li><\/ul>\n\n\n\n<p><strong>Also Check: <a href=\"https:\/\/www.oliveboard.in\/blog\/how-to-score-70-marks-in-ugc-net-paper-1\/\" target=\"_blank\" rel=\"noreferrer noopener\">How to Score 70+ Marks in Paper 1? Best Tricks &amp; Techniques<\/a><\/strong><\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Conclusion\"><\/span>Conclusion<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>The <strong>structure and composition of atmosphere<\/strong> play a crucial role in sustaining life, regulating climate, and enabling essential Earth processes. Each atmospheric layer has distinct characteristics that protect the <strong>planet, support weather patterns, and facilitate communication<\/strong>. The balanced composition of atmosphere, with gases like<strong> nitrogen, oxygen,<\/strong> and<strong> carbon dioxide<\/strong>, ensures respiration, photosynthesis, and temperature regulation. Any disruption in this balance can lead to climate change and environmental challenges. A clear understanding of the structure and composition of atmosphere is essential for environmental studies and <strong>UGC NET Geography preparation<\/strong>.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Structure and Composition of Atmosphere: The composition of atmosphere plays a crucial role in sustaining life on Earth, regulating climate,<\/p>\n","protected":false},"author":50,"featured_media":213981,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1,10236,11846,17417],"tags":[17500,17499],"class_list":["post-213958","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-articles","category-teaching-exams","category-ugc-net-teaching-exams","category-ugc-net-geography-study-material","tag-composition-of-atmosphere","tag-structure-and-composition-of-atmosphere","generate-columns","tablet-grid-50","mobile-grid-100","grid-parent","grid-50"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v26.6 (Yoast SEO v26.6) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Composition of Atmosphere - UGC NET Geography Notes<\/title>\n<meta name=\"description\" content=\"Discover the structure and composition of atmosphere, its layers, and crucial role in life on Earth for UGC NET Geography Preparation.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.oliveboard.in\/blog\/structure-and-composition-of-atmosphere\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Structure and Composition of Atmosphere - UGC NET Geography Notes\" \/>\n<meta property=\"og:description\" content=\"Structure and Composition of Atmosphere: The composition of atmosphere plays a crucial role in sustaining life on Earth, regulating climate, and\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.oliveboard.in\/blog\/structure-and-composition-of-atmosphere\/\" \/>\n<meta property=\"og:site_name\" content=\"Oliveboard\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/Oliveboard\" \/>\n<meta property=\"article:published_time\" content=\"2025-03-23T07:07:00+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2025-03-24T05:13:15+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.oliveboard.in\/blog\/wp-content\/uploads\/2025\/03\/composition-of-atmosphere.png\" \/>\n\t<meta property=\"og:image:width\" content=\"730\" \/>\n\t<meta property=\"og:image:height\" content=\"480\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/png\" \/>\n<meta name=\"author\" content=\"Saloni Singhal\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:creator\" content=\"@Oliveboard\" \/>\n<meta name=\"twitter:site\" content=\"@Oliveboard\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Saloni Singhal\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"4 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"NewsArticle\",\"@id\":\"https:\/\/www.oliveboard.in\/blog\/structure-and-composition-of-atmosphere\/#article\",\"isPartOf\":{\"@id\":\"https:\/\/www.oliveboard.in\/blog\/structure-and-composition-of-atmosphere\/\"},\"author\":{\"name\":\"Saloni Singhal\",\"@id\":\"https:\/\/www.oliveboard.in\/blog\/#\/schema\/person\/6aedd7baaab0f33dc2f40834a257f88c\"},\"headline\":\"Structure and Composition of Atmosphere &#8211; 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I'm a dedicated Government Job aspirant turned passionate writer &amp; content marketer. My blogs are a one-stop destination for accurate and comprehensive information on exam categories like Regulatory Bodies, Banking, SSC, State PSCs, and more. I am on a mission to provide you with all the details you need, conveniently in one place. When I am not writing and marketing, you will find me happily experimenting in the kitchen, cooking up delightful treats. 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