This document discusses the composition and structure of the atmosphere. It begins by defining the atmosphere and explaining its origin from early gases like hydrogen and helium. Over time, outgassing from the Earth's interior introduced other gases like water vapor, carbon dioxide and nitrogen. The major permanent gases that make up most of the atmosphere today are nitrogen, oxygen and argon. Variable gases like carbon dioxide, water vapor and ozone play important environmental roles despite small proportions. The atmosphere performs vital functions like supplying oxygen and protecting the planet from radiation. It facilitates processes like the water cycle and photosynthesis to support life.
1. The document discusses various types of pollution including air pollution, greenhouse effect, ozone layer depletion, and acid rain.
2. It notes that pollution can be in the form of chemical substances or energy and outlines some of the causes and effects of different pollutants.
3. Finally, it provides some recommendations for controlling pollution such as enforcing anti-pollution laws and properly disposing of materials.
The document provides an introduction to the geo-chemistry of the atmosphere. It discusses the composition and structure of the atmosphere. The atmosphere is divided into major layers including the troposphere, stratosphere, mesosphere and thermosphere. It describes the major and minor components of the atmosphere, including nitrogen, oxygen, carbon dioxide, ozone and others. The document also discusses atmospheric processes like the greenhouse effect and how human activities have increased carbon dioxide levels, impacting the climate.
This document provides information about the atmosphere and ozone layer. It begins by outlining syllabus objectives related to the ozone layer, greenhouse gases, and air pollution. It then defines the atmosphere and describes its composition. Subsequent sections explain how ozone is formed and maintained in the stratosphere, how CFCs deplete the ozone layer, and the environmental effects of ozone depletion. The document also discusses the importance of maintaining carbon dioxide levels and explains terms like the greenhouse effect.
The document provides information on the composition and structure of Earth's atmosphere. It discusses the following key points:
1. Earth's atmosphere can be divided into layers based on temperature and composition, including the troposphere, stratosphere, mesosphere, and thermosphere.
2. The principal gases that make up the atmosphere are nitrogen, oxygen, and argon, along with variable gases like carbon dioxide, methane, ozone, and water vapor.
3. Each layer serves important functions, such as the stratosphere containing the ozone layer which protects the surface from UV radiation, and the thermosphere where auroras occur.
The document discusses environmental chemistry, specifically the chemistry of the troposphere and stratosphere. It outlines several chemical reactions that occur in the atmosphere including the formation of acid rain, ozone, ammonium nitrates and sulfates, and carbon dioxide. It also discusses the release of oxides of carbon, sulfur, nitrogen, and volatile organic compounds associated with combustion of hydrocarbon fuels. Finally, it outlines problems associated with the release of these pollutants such as acid rain and hazardous inorganic and organic compounds like peroxyacetyl nitrate.
The problems attract worldwide attention K/a Global Environmental Problems.
The top three environmental problems are: (1) Greenhouse Effect and Global Warming (2) Depletion of Ozone and (3) Acid Rain.
1. The document discusses various types of pollution including air pollution, greenhouse effect, ozone layer depletion, and acid rain.
2. It notes that pollution can be in the form of chemical substances or energy and outlines some of the causes and effects of different pollutants.
3. Finally, it provides some recommendations for controlling pollution such as enforcing anti-pollution laws and properly disposing of materials.
The document provides an introduction to the geo-chemistry of the atmosphere. It discusses the composition and structure of the atmosphere. The atmosphere is divided into major layers including the troposphere, stratosphere, mesosphere and thermosphere. It describes the major and minor components of the atmosphere, including nitrogen, oxygen, carbon dioxide, ozone and others. The document also discusses atmospheric processes like the greenhouse effect and how human activities have increased carbon dioxide levels, impacting the climate.
This document provides information about the atmosphere and ozone layer. It begins by outlining syllabus objectives related to the ozone layer, greenhouse gases, and air pollution. It then defines the atmosphere and describes its composition. Subsequent sections explain how ozone is formed and maintained in the stratosphere, how CFCs deplete the ozone layer, and the environmental effects of ozone depletion. The document also discusses the importance of maintaining carbon dioxide levels and explains terms like the greenhouse effect.
The document provides information on the composition and structure of Earth's atmosphere. It discusses the following key points:
1. Earth's atmosphere can be divided into layers based on temperature and composition, including the troposphere, stratosphere, mesosphere, and thermosphere.
2. The principal gases that make up the atmosphere are nitrogen, oxygen, and argon, along with variable gases like carbon dioxide, methane, ozone, and water vapor.
3. Each layer serves important functions, such as the stratosphere containing the ozone layer which protects the surface from UV radiation, and the thermosphere where auroras occur.
The document discusses environmental chemistry, specifically the chemistry of the troposphere and stratosphere. It outlines several chemical reactions that occur in the atmosphere including the formation of acid rain, ozone, ammonium nitrates and sulfates, and carbon dioxide. It also discusses the release of oxides of carbon, sulfur, nitrogen, and volatile organic compounds associated with combustion of hydrocarbon fuels. Finally, it outlines problems associated with the release of these pollutants such as acid rain and hazardous inorganic and organic compounds like peroxyacetyl nitrate.
The problems attract worldwide attention K/a Global Environmental Problems.
The top three environmental problems are: (1) Greenhouse Effect and Global Warming (2) Depletion of Ozone and (3) Acid Rain.
This document provides an introduction and overview of atmospheric structure and composition and air pollution. It defines the atmosphere and describes its five layers - troposphere, stratosphere, mesosphere, thermosphere, and exosphere. It discusses the composition of the atmosphere, including the major gases of nitrogen, oxygen, carbon dioxide, ozone, and water vapor. It then defines air pollution, describes its various sources like industry and transportation, and classifies pollutants according to origin, state of matter, and source. The document provides context and definitions regarding the structure of the atmosphere and types and causes of air pollution.
The document discusses various topics related to atmospheric chemistry and air pollution. It begins with an overview of the composition and structure of the atmosphere, including the different layers (troposphere, stratosphere, mesosphere, thermosphere). It then covers various atmospheric reactions and processes, such as photochemical reactions, lapse rates, temperature inversions, and ozone layer formation and depletion. The document also discusses different air pollutants, their sources, effects, and methods for air quality monitoring and pollution control. Finally, it touches on related issues like the greenhouse effect, global warming, acid rain, and indoor air pollution.
Ozone Layer Depletion, Greenhouse Effect & Global WarmingNeetha Joseph
This is a presentation regarding some of those little threats our Earth is going through....The presentation is made interesting with a wide range of pictures, illustrations and animations...Please download to see the animated slideshow...Hope this comes of help to you!
The document summarizes key information about Earth's atmosphere, including its composition, layers, and importance. It discusses the following main points:
1. Earth's atmosphere is made up primarily of nitrogen (78%) and oxygen (21%), along with smaller amounts of other gases like carbon dioxide and argon.
2. The atmosphere is divided into four main layers - the troposphere, stratosphere, mesosphere, and thermosphere - which vary in temperature and density.
3. Greenhouse gases like carbon dioxide and methane trap heat in the lower atmosphere, creating Earth's natural greenhouse effect and warm temperatures that support life. Increased CO2 levels are enhancing the greenhouse effect and global warming.
The document summarizes key information about Earth's atmosphere, including its composition, layers, and importance. It discusses the following main points:
1. Earth's atmosphere is made up primarily of nitrogen (78%) and oxygen (21%), along with smaller amounts of other gases like argon, carbon dioxide, and water vapor.
2. The atmosphere is divided into four main layers - the troposphere, stratosphere, mesosphere, and thermosphere - which vary in temperature and density.
3. Key functions of the atmosphere include absorbing solar energy, recycling water and chemicals, protecting the planet from radiation, and supporting life on Earth.
Air pollution from fossil fuel power stations and vehicle emissions contains chemicals like nitrogen oxides and hydrocarbons that can form ground-level ozone and particulate matter through photochemical reactions. These pollutants present health risks and contribute to issues like acid rain and reduced air quality. Particulate matter less than 1 micrometer can remain suspended in the air for long periods and travel long distances, making air pollution a continental and global problem. Chemical pollution also affects water and soil through activities like burning fossil fuels and overuse of fertilizers and pesticides. Prevention efforts include using alternative fuels and more sustainable agricultural practices.
The document discusses global environmental concerns, specifically focusing on ozone layer depletion and global warming. It provides details on:
- The process of ozone depletion caused by CFCs and other ozone depleting substances releasing chlorine and bromine atoms that destroy ozone.
- Effects of ozone layer depletion including increased UV radiation impacting human health, plants, aquatic ecosystems and air quality.
- International agreements like the Montreal Protocol to phase out ozone depleting substances.
- Greenhouse gases like carbon dioxide and methane causing global warming by trapping heat in the atmosphere.
- Potential impacts of climate change like rising sea levels and temperatures threatening food security and biodiversity.
-
Learn all about Global warming and Ozone layer, find out why are we victims of global warming and what can we do to control the situation. Get a clear view of Ozone layer, Ozone Depletion as well as what to avoid in order to stop Ozone Depletion. Enjoy!!!
The document discusses air pollution and its causes, sources, classification, effects, and the structure of the atmosphere. It defines air pollution and describes the major layers of the atmosphere. It then covers the causes and sources of air pollution, how pollutants are classified, and the effects of air pollution on human health, vegetation, and animals. Key pollutants and their health impacts are also mentioned.
This document provides information about the layers of Earth's atmosphere. It describes the principal layers from lowest to highest as the troposphere, stratosphere, mesosphere, thermosphere (which includes the ionosphere and exosphere), and exosphere. For each layer it discusses the altitude ranges and key characteristics, such as temperature profiles and composition of gases. The document also provides background on the overall composition of air and major components like nitrogen, oxygen, and carbon dioxide.
Environmental chemistry is the study of the chemical and biochemical processes that occur in natural environments, including air, water, soil, and living organisms. It involves understanding the chemical properties and behavior of natural substances, such as minerals, gases, and organic matter, as well as the impact of human activities on the environment.
Air pollution has existed for centuries, exacerbated by the industrial revolution and rise of automobiles. Some key events in air pollution history include Hippocrates mentioning it in 400 BC, London's Smog of 1952 killing over 4,000, and the Bhopal gas tragedy of 1984 in India. The atmosphere is composed mainly of nitrogen and oxygen, and is divided into layers including the troposphere containing most air pollution. Primary pollutants such as carbon monoxides, nitrogen oxides, and particulates are emitted directly, while secondary pollutants form through atmospheric reactions. Unchecked air pollution can have severe health and environmental impacts.
The document provides an overview of Earth's atmosphere including:
- Its composition of nitrogen (78%), oxygen (21%), and trace amounts of other gases.
- It describes the layers of the atmosphere from lowest to highest - troposphere, stratosphere, mesosphere, thermosphere, and exosphere.
- Key topics covered include the nitrogen cycle, how pressure decreases with altitude, measuring pressure, atmospheric chemistry, and issues like acid rain, the greenhouse effect, and ozone depletion.
This presentation is about Ozone Layer and chemicals known to cause its depletion.
It also covers information about Ozone Hole and Correlation between Ozone depletion and skin diseases due to Ultra Violet light.It also contains no. of ways to limit ozone deterioration.
This document provides information about a student presentation on climate change and greenhouse gases. It includes the names and student IDs of 10 presenters, definitions and explanations of the greenhouse effect and greenhouse gases, descriptions of the major greenhouse gases and their sources, effects of climate change, ways to reduce greenhouse gases, and conclusions about the importance of the greenhouse effect for life on Earth.
Role of ozone in environment –
Ozone layer –
Ozone depleting gases –
Green House Effect –
Radioactive effects of Greenhouse gases –
The Hydrological cycle –
Green House Gases and Global Warming –
Carbon Cycle.
Ozone is a naturally occurring molecule made up of three oxygen atoms. It has the chemical formula O3.
The word ‘ozone’ is derived from the Greek word óζειν which means “to smell”. Its strong smell allows scientists to detect it in low amounts.
Ozone is found in different levels of the earth’s atmosphere.
About 90% of ozone in the atmosphere is concentrated between 15 and 30 kilometres above the earth's surface (stratospheric ozone).
At this level it provides a protective shield from the sun, we think of this as good ozone.
It is also found at ground level in lower concentrations (tropospheric ozone).
Here ozone is a pollutant that is a key part of smog over cities and we think of it as bad ozone.
Atmospheric data demonstrates that ozone depleting substances are destroying ozone in the stratosphere and thinning the earth’s ozone layer.
Ozone depleting substances are chemicals that include -
chlorofluorocarbons (CFCs); nontoxic, nonflammable chemicals containing atoms of carbon, chlorine, and fluorine.
halons, group of organohalogen compounds containing bromine and fluorine and one or two carbons.
carbon tetrachloride (CCl4),
methyl chloroform (CH3CCl3),
Hydro-bromo-fluoro-carbons (HBFCs),
Hydro-chloro-fluoro-carbons (HCFCs),
methyl bromide (CH3Br) and
bromochloromethane (CH2BrCl).
They deplete the ozone layer by releasing chlorine and bromine atoms into the stratosphere, which destroy ozone molecules.
These and other ozone depleting substances also contribute, to varying extents, to global warming
The document discusses ozone depletion and the ozone layer. It defines ozone and how it forms, and describes the ozone layer's location and role in protecting the Earth. It then discusses the discovery of the ozone hole, the causes of ozone depletion including CFCs, and solutions implemented through the Montreal Protocol to phase out ozone-depleting substances and allow the ozone layer to recover by 2050.
9Global warming, GH effect, Ozone depletion and Acid Deposition.pdfShubhamParmar75
This document discusses global warming and climate change. It begins by explaining how greenhouse gases like carbon dioxide and methane trap heat in the atmosphere, causing the greenhouse effect and global warming. It then discusses how the concentration of carbon dioxide has increased since the industrial revolution due to human activities like burning fossil fuels. This is causing the average global temperature to rise by about 0.5°C over the past century. General circulation models predict further warming of 1.5-4.5°C by 2100 will cause sea levels to rise and affect agriculture, ecosystems, and human health.
This document discusses various topics related to environmental pollution and protection. It defines biodegradable and non-biodegradable pollutants, and mentions automobile pollution and its control. It also discusses electrostatic precipitators, drinking water quality standards, impacts of modern agriculture on soil, and primary waste water treatment methods. Other sections cover the greenhouse effect, global warming causes, the ozone layer and ozone depletion, major environmental protocols like the Montreal Protocol and Kyoto Protocol, and greenhouse gases that contribute to the greenhouse effect. Finally, it provides short questions to test understanding of topics like air pollution, soil pollution, global warming, ozone depletion, solid waste management, and noise pollution.
বাংলাদেশের অর্থনৈতিক সমীক্ষা ২০২৪ [Bangladesh Economic Review 2024 Bangla.pdf] কম্পিউটার , ট্যাব ও স্মার্ট ফোন ভার্সন সহ সম্পূর্ণ বাংলা ই-বুক বা pdf বই " সুচিপত্র ...বুকমার্ক মেনু 🔖 ও হাইপার লিংক মেনু 📝👆 যুক্ত ..
আমাদের সবার জন্য খুব খুব গুরুত্বপূর্ণ একটি বই ..বিসিএস, ব্যাংক, ইউনিভার্সিটি ভর্তি ও যে কোন প্রতিযোগিতা মূলক পরীক্ষার জন্য এর খুব ইম্পরট্যান্ট একটি বিষয় ...তাছাড়া বাংলাদেশের সাম্প্রতিক যে কোন ডাটা বা তথ্য এই বইতে পাবেন ...
তাই একজন নাগরিক হিসাবে এই তথ্য গুলো আপনার জানা প্রয়োজন ...।
বিসিএস ও ব্যাংক এর লিখিত পরীক্ষা ...+এছাড়া মাধ্যমিক ও উচ্চমাধ্যমিকের স্টুডেন্টদের জন্য অনেক কাজে আসবে ...
This document provides an introduction and overview of atmospheric structure and composition and air pollution. It defines the atmosphere and describes its five layers - troposphere, stratosphere, mesosphere, thermosphere, and exosphere. It discusses the composition of the atmosphere, including the major gases of nitrogen, oxygen, carbon dioxide, ozone, and water vapor. It then defines air pollution, describes its various sources like industry and transportation, and classifies pollutants according to origin, state of matter, and source. The document provides context and definitions regarding the structure of the atmosphere and types and causes of air pollution.
The document discusses various topics related to atmospheric chemistry and air pollution. It begins with an overview of the composition and structure of the atmosphere, including the different layers (troposphere, stratosphere, mesosphere, thermosphere). It then covers various atmospheric reactions and processes, such as photochemical reactions, lapse rates, temperature inversions, and ozone layer formation and depletion. The document also discusses different air pollutants, their sources, effects, and methods for air quality monitoring and pollution control. Finally, it touches on related issues like the greenhouse effect, global warming, acid rain, and indoor air pollution.
Ozone Layer Depletion, Greenhouse Effect & Global WarmingNeetha Joseph
This is a presentation regarding some of those little threats our Earth is going through....The presentation is made interesting with a wide range of pictures, illustrations and animations...Please download to see the animated slideshow...Hope this comes of help to you!
The document summarizes key information about Earth's atmosphere, including its composition, layers, and importance. It discusses the following main points:
1. Earth's atmosphere is made up primarily of nitrogen (78%) and oxygen (21%), along with smaller amounts of other gases like carbon dioxide and argon.
2. The atmosphere is divided into four main layers - the troposphere, stratosphere, mesosphere, and thermosphere - which vary in temperature and density.
3. Greenhouse gases like carbon dioxide and methane trap heat in the lower atmosphere, creating Earth's natural greenhouse effect and warm temperatures that support life. Increased CO2 levels are enhancing the greenhouse effect and global warming.
The document summarizes key information about Earth's atmosphere, including its composition, layers, and importance. It discusses the following main points:
1. Earth's atmosphere is made up primarily of nitrogen (78%) and oxygen (21%), along with smaller amounts of other gases like argon, carbon dioxide, and water vapor.
2. The atmosphere is divided into four main layers - the troposphere, stratosphere, mesosphere, and thermosphere - which vary in temperature and density.
3. Key functions of the atmosphere include absorbing solar energy, recycling water and chemicals, protecting the planet from radiation, and supporting life on Earth.
Air pollution from fossil fuel power stations and vehicle emissions contains chemicals like nitrogen oxides and hydrocarbons that can form ground-level ozone and particulate matter through photochemical reactions. These pollutants present health risks and contribute to issues like acid rain and reduced air quality. Particulate matter less than 1 micrometer can remain suspended in the air for long periods and travel long distances, making air pollution a continental and global problem. Chemical pollution also affects water and soil through activities like burning fossil fuels and overuse of fertilizers and pesticides. Prevention efforts include using alternative fuels and more sustainable agricultural practices.
The document discusses global environmental concerns, specifically focusing on ozone layer depletion and global warming. It provides details on:
- The process of ozone depletion caused by CFCs and other ozone depleting substances releasing chlorine and bromine atoms that destroy ozone.
- Effects of ozone layer depletion including increased UV radiation impacting human health, plants, aquatic ecosystems and air quality.
- International agreements like the Montreal Protocol to phase out ozone depleting substances.
- Greenhouse gases like carbon dioxide and methane causing global warming by trapping heat in the atmosphere.
- Potential impacts of climate change like rising sea levels and temperatures threatening food security and biodiversity.
-
Learn all about Global warming and Ozone layer, find out why are we victims of global warming and what can we do to control the situation. Get a clear view of Ozone layer, Ozone Depletion as well as what to avoid in order to stop Ozone Depletion. Enjoy!!!
The document discusses air pollution and its causes, sources, classification, effects, and the structure of the atmosphere. It defines air pollution and describes the major layers of the atmosphere. It then covers the causes and sources of air pollution, how pollutants are classified, and the effects of air pollution on human health, vegetation, and animals. Key pollutants and their health impacts are also mentioned.
This document provides information about the layers of Earth's atmosphere. It describes the principal layers from lowest to highest as the troposphere, stratosphere, mesosphere, thermosphere (which includes the ionosphere and exosphere), and exosphere. For each layer it discusses the altitude ranges and key characteristics, such as temperature profiles and composition of gases. The document also provides background on the overall composition of air and major components like nitrogen, oxygen, and carbon dioxide.
Environmental chemistry is the study of the chemical and biochemical processes that occur in natural environments, including air, water, soil, and living organisms. It involves understanding the chemical properties and behavior of natural substances, such as minerals, gases, and organic matter, as well as the impact of human activities on the environment.
Air pollution has existed for centuries, exacerbated by the industrial revolution and rise of automobiles. Some key events in air pollution history include Hippocrates mentioning it in 400 BC, London's Smog of 1952 killing over 4,000, and the Bhopal gas tragedy of 1984 in India. The atmosphere is composed mainly of nitrogen and oxygen, and is divided into layers including the troposphere containing most air pollution. Primary pollutants such as carbon monoxides, nitrogen oxides, and particulates are emitted directly, while secondary pollutants form through atmospheric reactions. Unchecked air pollution can have severe health and environmental impacts.
The document provides an overview of Earth's atmosphere including:
- Its composition of nitrogen (78%), oxygen (21%), and trace amounts of other gases.
- It describes the layers of the atmosphere from lowest to highest - troposphere, stratosphere, mesosphere, thermosphere, and exosphere.
- Key topics covered include the nitrogen cycle, how pressure decreases with altitude, measuring pressure, atmospheric chemistry, and issues like acid rain, the greenhouse effect, and ozone depletion.
This presentation is about Ozone Layer and chemicals known to cause its depletion.
It also covers information about Ozone Hole and Correlation between Ozone depletion and skin diseases due to Ultra Violet light.It also contains no. of ways to limit ozone deterioration.
This document provides information about a student presentation on climate change and greenhouse gases. It includes the names and student IDs of 10 presenters, definitions and explanations of the greenhouse effect and greenhouse gases, descriptions of the major greenhouse gases and their sources, effects of climate change, ways to reduce greenhouse gases, and conclusions about the importance of the greenhouse effect for life on Earth.
Role of ozone in environment –
Ozone layer –
Ozone depleting gases –
Green House Effect –
Radioactive effects of Greenhouse gases –
The Hydrological cycle –
Green House Gases and Global Warming –
Carbon Cycle.
Ozone is a naturally occurring molecule made up of three oxygen atoms. It has the chemical formula O3.
The word ‘ozone’ is derived from the Greek word óζειν which means “to smell”. Its strong smell allows scientists to detect it in low amounts.
Ozone is found in different levels of the earth’s atmosphere.
About 90% of ozone in the atmosphere is concentrated between 15 and 30 kilometres above the earth's surface (stratospheric ozone).
At this level it provides a protective shield from the sun, we think of this as good ozone.
It is also found at ground level in lower concentrations (tropospheric ozone).
Here ozone is a pollutant that is a key part of smog over cities and we think of it as bad ozone.
Atmospheric data demonstrates that ozone depleting substances are destroying ozone in the stratosphere and thinning the earth’s ozone layer.
Ozone depleting substances are chemicals that include -
chlorofluorocarbons (CFCs); nontoxic, nonflammable chemicals containing atoms of carbon, chlorine, and fluorine.
halons, group of organohalogen compounds containing bromine and fluorine and one or two carbons.
carbon tetrachloride (CCl4),
methyl chloroform (CH3CCl3),
Hydro-bromo-fluoro-carbons (HBFCs),
Hydro-chloro-fluoro-carbons (HCFCs),
methyl bromide (CH3Br) and
bromochloromethane (CH2BrCl).
They deplete the ozone layer by releasing chlorine and bromine atoms into the stratosphere, which destroy ozone molecules.
These and other ozone depleting substances also contribute, to varying extents, to global warming
The document discusses ozone depletion and the ozone layer. It defines ozone and how it forms, and describes the ozone layer's location and role in protecting the Earth. It then discusses the discovery of the ozone hole, the causes of ozone depletion including CFCs, and solutions implemented through the Montreal Protocol to phase out ozone-depleting substances and allow the ozone layer to recover by 2050.
9Global warming, GH effect, Ozone depletion and Acid Deposition.pdfShubhamParmar75
This document discusses global warming and climate change. It begins by explaining how greenhouse gases like carbon dioxide and methane trap heat in the atmosphere, causing the greenhouse effect and global warming. It then discusses how the concentration of carbon dioxide has increased since the industrial revolution due to human activities like burning fossil fuels. This is causing the average global temperature to rise by about 0.5°C over the past century. General circulation models predict further warming of 1.5-4.5°C by 2100 will cause sea levels to rise and affect agriculture, ecosystems, and human health.
This document discusses various topics related to environmental pollution and protection. It defines biodegradable and non-biodegradable pollutants, and mentions automobile pollution and its control. It also discusses electrostatic precipitators, drinking water quality standards, impacts of modern agriculture on soil, and primary waste water treatment methods. Other sections cover the greenhouse effect, global warming causes, the ozone layer and ozone depletion, major environmental protocols like the Montreal Protocol and Kyoto Protocol, and greenhouse gases that contribute to the greenhouse effect. Finally, it provides short questions to test understanding of topics like air pollution, soil pollution, global warming, ozone depletion, solid waste management, and noise pollution.
বাংলাদেশের অর্থনৈতিক সমীক্ষা ২০২৪ [Bangladesh Economic Review 2024 Bangla.pdf] কম্পিউটার , ট্যাব ও স্মার্ট ফোন ভার্সন সহ সম্পূর্ণ বাংলা ই-বুক বা pdf বই " সুচিপত্র ...বুকমার্ক মেনু 🔖 ও হাইপার লিংক মেনু 📝👆 যুক্ত ..
আমাদের সবার জন্য খুব খুব গুরুত্বপূর্ণ একটি বই ..বিসিএস, ব্যাংক, ইউনিভার্সিটি ভর্তি ও যে কোন প্রতিযোগিতা মূলক পরীক্ষার জন্য এর খুব ইম্পরট্যান্ট একটি বিষয় ...তাছাড়া বাংলাদেশের সাম্প্রতিক যে কোন ডাটা বা তথ্য এই বইতে পাবেন ...
তাই একজন নাগরিক হিসাবে এই তথ্য গুলো আপনার জানা প্রয়োজন ...।
বিসিএস ও ব্যাংক এর লিখিত পরীক্ষা ...+এছাড়া মাধ্যমিক ও উচ্চমাধ্যমিকের স্টুডেন্টদের জন্য অনেক কাজে আসবে ...
Temple of Asclepius in Thrace. Excavation resultsKrassimira Luka
The temple and the sanctuary around were dedicated to Asklepios Zmidrenus. This name has been known since 1875 when an inscription dedicated to him was discovered in Rome. The inscription is dated in 227 AD and was left by soldiers originating from the city of Philippopolis (modern Plovdiv).
Main Java[All of the Base Concepts}.docxadhitya5119
This is part 1 of my Java Learning Journey. This Contains Custom methods, classes, constructors, packages, multithreading , try- catch block, finally block and more.
Philippine Edukasyong Pantahanan at Pangkabuhayan (EPP) CurriculumMJDuyan
(𝐓𝐋𝐄 𝟏𝟎𝟎) (𝐋𝐞𝐬𝐬𝐨𝐧 𝟏)-𝐏𝐫𝐞𝐥𝐢𝐦𝐬
𝐃𝐢𝐬𝐜𝐮𝐬𝐬 𝐭𝐡𝐞 𝐄𝐏𝐏 𝐂𝐮𝐫𝐫𝐢𝐜𝐮𝐥𝐮𝐦 𝐢𝐧 𝐭𝐡𝐞 𝐏𝐡𝐢𝐥𝐢𝐩𝐩𝐢𝐧𝐞𝐬:
- Understand the goals and objectives of the Edukasyong Pantahanan at Pangkabuhayan (EPP) curriculum, recognizing its importance in fostering practical life skills and values among students. Students will also be able to identify the key components and subjects covered, such as agriculture, home economics, industrial arts, and information and communication technology.
𝐄𝐱𝐩𝐥𝐚𝐢𝐧 𝐭𝐡𝐞 𝐍𝐚𝐭𝐮𝐫𝐞 𝐚𝐧𝐝 𝐒𝐜𝐨𝐩𝐞 𝐨𝐟 𝐚𝐧 𝐄𝐧𝐭𝐫𝐞𝐩𝐫𝐞𝐧𝐞𝐮𝐫:
-Define entrepreneurship, distinguishing it from general business activities by emphasizing its focus on innovation, risk-taking, and value creation. Students will describe the characteristics and traits of successful entrepreneurs, including their roles and responsibilities, and discuss the broader economic and social impacts of entrepreneurial activities on both local and global scales.
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it describes the bony anatomy including the femoral head , acetabulum, labrum . also discusses the capsule , ligaments . muscle that act on the hip joint and the range of motion are outlined. factors affecting hip joint stability and weight transmission through the joint are summarized.
Walmart Business+ and Spark Good for Nonprofits.pdfTechSoup
"Learn about all the ways Walmart supports nonprofit organizations.
You will hear from Liz Willett, the Head of Nonprofits, and hear about what Walmart is doing to help nonprofits, including Walmart Business and Spark Good. Walmart Business+ is a new offer for nonprofits that offers discounts and also streamlines nonprofits order and expense tracking, saving time and money.
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The event will cover the following::
Walmart Business + (https://business.walmart.com/plus) is a new shopping experience for nonprofits, schools, and local business customers that connects an exclusive online shopping experience to stores. Benefits include free delivery and shipping, a 'Spend Analytics” feature, special discounts, deals and tax-exempt shopping.
Special TechSoup offer for a free 180 days membership, and up to $150 in discounts on eligible orders.
Spark Good (walmart.com/sparkgood) is a charitable platform that enables nonprofits to receive donations directly from customers and associates.
Answers about how you can do more with Walmart!"
Beyond Degrees - Empowering the Workforce in the Context of Skills-First.pptxEduSkills OECD
Iván Bornacelly, Policy Analyst at the OECD Centre for Skills, OECD, presents at the webinar 'Tackling job market gaps with a skills-first approach' on 12 June 2024
1. UNIT TWO
THE MEANING, ORIGIN, FUNCTIONS, COMPOSITION AND
STRUCTURE OF THE ATMOSPHERE
Atmosphere: Meaning
The atmosphere is a mixture of gases and
suspended particles of liquid and solid which
entirely envelop the earth.
It constitutes the outer most layers of the
environmental spheres.
It is a canopy over the hydrosphere and the
lithosphere, plays a crucial role in supporting the
biosphere.
Its outer limit is not exactly known (10,000 kms
vs 1000 kms).
1
2. Atmosphere is colorless, odorless, tasteless and
cannot be felt except when it is in motion.
Moreover it is mobile, elastic, compressible and
expandable.
Origin of the Atmosphere
A variety of astronomical evidences and
insights suggest that the earth’s original
atmosphere probably developed around
the time the solar system formed; about
4.6 billion years ago.
2
3. Hence, the earth’s earliest atmosphere,
which is also called the primary
atmosphere, must have been comprised of
the same gases from which the earth and
other members of the solar system were
formed.
Nebula Theory
According to this theory, the principal
gases that constituted the original
atmosphere are believed to have been
hydrogen, helium and hydrogen
compounds (e.g. NH4, NH3 etc) 3
4. These gases, however, believed to have escaped
the full earth’s gravitational attraction to the
extraterrestrial space for they are extremely light
molecules.
Hence, the earth is striped of its primitive
atmosphere.
However, we do also have an atmosphere
today. Where did it come from?
Scientists believe that billions of years ago
gases that might have trapped in the earth’s hot
interior during its formation expelled at the
surface latter by large number of volcanoes,
fissures, and fumaroles (steam vent)
4
5. Through the process of outgassing, the
outpouring of gases from the earth's interior,
many other gases were injected into the
atmosphere. These include:
• Water vapor (produced rain - rivers, lakes,
oceans)
• Carbon dioxide
• Nitrogen
As outgassing occurred over a period of
millions of years, the atmosphere evolved to its
current state.
The dominant gases in the present day
atmosphere are nitrogen (78%), oxygen (21%)
and Argon (0.93%). 5
6. Functions of the Atmosphere
Atmosphere performs a number of vital functions
It supplies oxygen to animals and CO2 to plants
during respiration and photosynthesis,
respectively. Thus, it made the earth a livable
place.
It protects our planet earth from the impact of
small falling meteors, which are usually
incinerated by friction before reaching the earth’s
surface.
The blanketing influence of the atmosphere also
protects us from most lethal ultraviolet and
cosmic radiations
Maintains the daily temperature balance by
regulating different proportions of both solar and
earth’s radiation.
6
7. This is because the atmosphere contains
greenhouse gases (heat trapping gases).
It also regulates global temperature balance
through horizontal air circulation.
The atmosphere makes the hydrological cycle
possible, a cycle that provides water to the
surface of the earth.
It has made radio and TV communication
possible over long distances.
7
8. PRESENT COMPOSITION OF THE ATMOSPHERE
Major Components of the Atmosphere
The major components of the present day atmosphere
can be divided in to three major categories.
i) Non-variable (permanent) gases,
ii) Variable gases, and
iii) Particulates
The Non- Variable (Permanent) Gases
These are gasses whose relative proportion remains
unchanged.
These are gasses that are also sufficiently stable, both
physically and chemically.
These gasses remain long enough in the atmosphere
with out taking part in certain chemical reactions.
8
9. They comprise 98 percent of the total atmosphere
by volume. These are gasses like Nitrogen (N2),
Oxygen (O2), Argon (Ar), Neon (Ne), Helium (He)
etc...
a. Nitrogen
Nitrogen (78%)is a relatively inert gas produced
primarily by volcanic activity.
Nitrogen, the most dominant gas in the
atmosphere that is chemically inactive and doesn’t
participate directly in the respiratory processes.
Though it is removed by the nitrifying bacteria, it
returns to the atmosphere mainly through the
decaying of plants and animals matter.
9
10. b. Oxygen
Oxygen is removed from the atmosphere when
organic matter decays and when it combines with
other substances producing oxides. It is also taken
from the atmosphere during breathing.
In contrary, the addition of oxygen to the
atmosphere occurs during photosynthesis.
c. Argon
Argon is produced by radio active decay of K-40.
When the decay of k-40 occurs nearer to the
surface it diffuses to the atmosphere. It is one of
the inert gases.
10
11. 2. Variable Gases
These are atmospheric gases that vary appreciably in
relative abundance over a short period of time.
Although they collectively comprise only a very small
proportion of the atmosphere’s total mass and volume.
Three of them are carbon dioxide, water vapor and ozone
and play a crucial role in the existence of life.
a. Carbon dioxide
Carbon dioxide (CO2) makes up only 0.036% of the
atmosphere by volume.
Carbon dioxide is essential to photosynthetic processes of
plants. Huge quantities of carbon is stored in plant tissue,
deposits of coal, peat, oil, and gas.
11
12. Carbon dioxide is taken in by plants and
during photosynthesis is combined with water
and energy to form oxygen and
carbohydrates.
Because vegetation takes in so much carbon
dioxide, we often refer to plants as a "sink" for
it.
Carbon dioxide in the atmosphere varies
throughout the year, decreasing slightly during
the summer as plants leaf out, and then
increases during the winter as plants go
dormant and photosynthesis decreases.
12
13. b. Water Vapor
Shows Spatio-temporal variation
In warm tropical locations close to the surface, it
may account up to 4 percent of the atmospheric
gases while in cold polar regions, its
concentration may dwindle to a mere trace.
13
14. Spatio-temporal variation is ascribed to two major
factors
a) Air temperature: warm and moist air can hold
more water vapor than can cold and dry air.
b) The nature of the earth’s surface: air over land
surface is generally drier than air over water
surface.
Water vapor is important from the following
perspectives.
It is critically important to life on earth because it
is the source of all forms of the earth’s
precipitation.
14
15. Latent heat which is an important source of
atmospheric energy especially for storms, such
as thunder storms and hurricanes are powered
by the heat released during the condensation of
water vapor
Water vapor strongly absorbs infrared radiation
given off by the earth, making it an important
green house gases in the earth’s heat balance
15
16. c. Ozone
Ozone is the third most abundant variable gas
which exists in triatomic form of oxygen.
The majority (about 97%) of atmospheric ozone is
found in the upper atmosphere, that is, the
stratosphere where it is formed naturally as
oxygen atoms (O) combine with oxygen molecules
(O2).
Though its concentration is less than 0.002% by
volume, ozone is important due to the fact that it
shields plants, animals and human being from the
damaging effects of ultraviolet rays.
16
17. Had the ultraviolet radiation reached the earth’s
surface with its full intensity, (1) the yields of
many agricultural crops would be greatly
decreased; (2) the incidence of skin cancer and
eye diseases such as cataract would be increased
Production of Ozone (03)
When oxygen atoms (0) combine with oxygen
molecules (02) forms 03
- Not destructed by the ultra violet radiation
17
18. Although it mainly forms , above 25 kms in the
atmosphere, ozone gradually drifts downward by
mixing processes, producing a maximum
concentration near 25 km.
18
19. Destruction of Ozone
Research results have shown that the average
global concentration of stratospheric ozone
declined by about 3 percent between 1969 and
1985.
The British Antarctic Survey also discovered a
hole in the ozone layer over Antarctica. The
Ozone layer depleted over Antarctica extends
form 12 to 20 km in altitude.
19
20. The stratospheric ozone (10-65 km) may be upset
by the CFC (Chlorofluorocarbons or
halocarbons) gasses injected in to the
atmosphere, i.e. in to the stratosphere.
What are the chemical processes (reactions)
involved in the destruction of ozone gas?
1. Individual chlorine atoms which are released from
CFC by photo dissociations are very important in
the destruction of the ozone layer (30 kms).
20
21. One Chlorine ion (Cl-) released combines with
ozone rapidly forming chlorine monoxide (ClO)
and molecular oxygen (O2).
The chlorine monoxide reacts with another ozone
molecule to make chlorine dioxide, which
dissociates in to oxygen and a reactive chlorine
ion that initiates the cycle over again.
21
22. The Major Sources of Chlorofluorocarbons Gas
Propellants used in spray cans (aerosols) such as
hair spray, deodorants and fly killer
Refrigerator coolant
Air conditioner
Foam producing industries, and
Solvents
22
23. III. Particulates
Particulates consist of liquids and solids (with the
exception of water droplets or ice crystals)
particle that are found suspended in the
atmosphere because of their small size.
Most particulates are solids rather than liquids,
and are collectively referred to as dust (aerosols)
Aerosols are usually derived from two major
sources: natural and anthropogenic sources
23
24. Natural Sources
Natural sources releasing atmospheric dust include:
Dust generated when meteors incinerated in the
atmosphere
Volcanic dust and ash released by volcanisms
Wind blow surface material
Salt crystals released from the evaporation of sea
spray
Dust particles of biological origin including pollen,
spores, seeds and bacteria
24
25. Antropogenic sources
Dust generating human activities include:
Factory and automobile exhaust
Smoke from home heating and cooling
Farming areas
Airborne pesticides
Burning of grasses
25
26. Though most particulates (or atmospheric
impurities) are nuisance, as well as, health
hazards, (or pollutants), some air born
particulates play a vital role in atmospheric
processes and in the formation of clouds and
precipitation serving as condensation
(hygroscopic) nuclei.
26
27. VERTICAL STRUCTURE (VERTICAL LAYERING) OF THE ATMOSPHERE
Compositional Layers
The atmosphere is divided into two major
compositional layers: homosphere and heterosphere.
Homosphere
It lies between the earth’s surface and 80 kilometers
above the surface
It contains more than 99.9 percent of the total air
In this part of the atmosphere, various gasses are kept
mixed by wind currents so that the proportion of the
non-variable gases remains constant
27
28. Because of its relatively homogeneous composition,
this portion of the atmosphere is some times termed
as homosphere
The ability of the homosphere’s gases to remain
mixed actually attributed to the mixing action of
wind currents and the numerous collusions between
air molecules
28
29. Heterosphere
It is part of the atmosphere above 80 kms.
Density of the atmosphere above 80 kilometer is
low so that the number of air molecules colliding
is greatly reduced
Wind flows at these higher altitude is also
predominantly horizontal
air currents are subjected to very little vertical
mixing.
At higher altitudes (i.e. above 80k.m), various
gases exhibit an increasing tendency to be
layered on the basis of density (or atomic
weight).
29
31. Thermal Layers
These are layers on the basis of the vertical
distribution of air temperature
Troposphere
It is lowest layer of the atmosphere.
It extends on average to about 11 kilometers
from the surface.
It extends upward from the surface to about
16 kilometers over the equator and only to
about 8 km from the surface over the Polar
Regions
31
32. 75 percent of the total molecular or
gaseous mass of the atmosphere and
virtually, water vapor and aerosols, are
concentrated in this layer.
This layer is responsible for all weather
condition (most weather phenomena
occur in this part of the atmosphere, it is
some times called the weather sphere).
Temperature in this portion of the
atmosphere uniformly falls with increasing
altitude by 6.50C/ 1000 m ascent /descent
(normal environmental lapse rate)
32
34. The Stratosphere
It extends from the tropo-pause to an
altitude of 50 kilometers.
In this layer, temperature inversion occurs
It is the ozone gas that plays a major part
in heating the air at this altitude
(important because it absorbs energetic
ultraviolet solar radiation)
At this part of the atmosphere, increased
motions of Ozone gas represent a higher
temperature.
34
35. The maximum concentration of ozone in
the stratosphere is observed near 25 km.
Yet, the stratospheric air temperature
reaches a maximum of near 50 kms.
The reason for this is that, the air at 50 km
is less dense than that at 25 km, and so,
the absorption of intense solar energy, at
50 km rises the temperature of the fewer
molecules to much greater degree.
35
36. Mesosphere
It is also called middle sphere
It represents part of the atmosphere that lies
between the stratosphere and thermosphere
(50-80km above the surface)
Air at this level is extremely thin and the
atmospheric pressure is quite low (1013 mill
bars at sea level averages to1mb at 50 km
above sea level)
temperature in the mesosphere decreases
with height there is little ozone in the air to
absorb solar radiation
36
37. Consequently, there would be more losing
of energy than absorbing.
Thus, it is the coldest and the darkest part
of the atmosphere
Because of air’s low density in this region,
our brain would soon become oxygen
starved, a condition known as hypoxia.
Thermosphere
This is the outermost layer of the atmosphere
that extends outward from about 80 km to 1600
kms.
37
38. At this layer, temperature gradually rises to
eventually reach about 1500 C0
This layer blocks a variety of harmful
cosmic radiation including x-rays, gamma
rays, and some ultraviolet radiation
Ultraviolet solar radiation is absorbed
mainly by molecular nitrogen and oxygen
(O2)
This radiation supplies enough energy to
break molecular oxygen in to two separate
oxygen atoms (O).
38
39. The energy "left over" after the separation
of the oxygen molecule increases the
speed of motion of the atoms.
Because there are relatively few atoms and
molecules in the thermosphere, the
absorption of a small amount of solar
radiation can cause a large increase in
temperature, consequently there is an
inversion.
39
40. The Ionosphere
An electrified region with in the upper
atmosphere primarily the thermosphere
where fairly large concentration of ions
and free electrons exist.
40
41. What are the primary causes of Ionization in
the ionosphere?
The primary causes of ionization in the
ionosphere are:
- Ultraviolet radiation and x-ray from the sun
- High energy cosmic rays from the sun and from
super nova.
- Collusion between air molecules and energetic
particle.
The electrical regions of the ionosphere play a
major role in radio communications. This is
because ions are reflectors of radio waves.
41
42. Exosphere
At very high altitudes above the earth the
atmosphere becomes extremely thin.
At this level, atoms and molecules move
quite a distance before they collide with
one another
At 250 km above the earth’s surface, an
atom can move an average distance called
mean free path of 1000 meter before
colliding with another atom.
42
43. Since the chance of molecular collusion is
reduced, many of the lighter, faster moving
molecules actually escape the earth’s
gravitational pull.
Part of the atmosphere where atoms and
molecules shoot off in to space is called
exosphere, which represents the upper limit of
the earth’s atmosphere.
43