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Atmosphere characteristics

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http://pickinpost.net/Education/education.php
PowerPoint presentation sample from an Earth Science packet that contains 48 successfully proven in the classroom presentations that cover all areas of Earth Science from middle school to college. A full description of the content that all 48 presentations cover can be found by going to my website and reading the short summary. If you would like to purchase please click on the MAKE OFFER button that will allow you send me an email in your interest. I will respond with how you can easily own these presentations and start using them in the classroom. Thank you for watching!

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  • This PowerPoint lesson and its content is copyright of Craig Warner [cwarner@teachpower.net] TeachPower.net - © TeachPower.net 2005 . All rights reserved. Any redistribution or reproduction of part or all of the contents in any form is prohibited other than the following: You may print or download to a local hard disk extracts for your personal and non-commercial use only. You may copy the content to individual third parties for their personal use, but only if you acknowledge the website (http://teachpower.net) and cwarner@teachpower.net as the source of the material. You may change, add, or delete content for your personal and non-commercial use to fit your school’s curriculum. You may not , except with my express written permission via email , distribute or commercially exploit the content. Nor may you transmit it or store it in any other website or other form of electronic retrieval system.
  • Transcript

    • 1. Changing AtmosphereChanging Atmosphere created by TeachPower.net
    • 2. Origin of the AtmosphereOrigin of the Atmosphere • 4.6 billion years ago the earth’s atmosphere was probably made of hydrogen and helium. • Earth’s surface was covered in volcanoes and lakes of lava. –Volcanoes release large amounts of CO2, steam, and N2.
    • 3. Origin of the Atmosphere CONT’DOrigin of the Atmosphere CONT’D • CO2 absorbs heat which warmed the atmosphere. • When the volcanic activity subsided steam condensed to form –Clouds –Rivers and lakes
    • 4. Today’s AtmosphereToday’s Atmosphere • Today the atmosphere mostly consist of nitrogen and oxygen not hydrogen and CO2.
    • 5. SmogSmog • Because of the Industrial Age our atmosphere is consistently being filled with pollutants. • When these pollutants accumulate in the upper atmosphere it creates a layer called smog.
    • 6. Greenhouse EffectGreenhouse Effect • CO2 and other gases absorb infrared radiation that enters from space and reflects from the ground. • When this heat is trapped it warms the atmosphere – Greenhouse Effect.
    • 7. Ozone DepletionOzone Depletion • Ozone is the layer of air in the stratosphere that protects us from UV radiation. • This layer is thinning slowly due to chemicals released into the air by styrofoam, air conditioners, aerosol cans called chlorofluorocarbons (CFC’s).
    • 8. Earth’s AtmosphereEarth’s Atmosphere • Layer of air made up of a mixture of gases with some suspended solids and liquids. • Other Gases: Argon, CO2, H2O • Trace Gases: Ne, He, Methane, Kr, Xe, H, O3 • Other types of gases are smog, O3 Atmosphere Nitrogen Oxygen Other Gases
    • 9. Types of Solids & LiquidsTypes of Solids & Liquids • Dust, salt, & ice – How do you think those 3 solids end up in the air? • Water Vapor – Water is the only substance that appears in the atmosphere in all 3 states (solid, liquid, and gas)
    • 10. Structure of the AtmosphereStructure of the Atmosphere • Troposphere – weather, clouds, and smog occur in this layer. “Tropos” means “changing” in Greek/Latin. At the top of the temp. is about –76 ºF. • Stratosphere – O3 (Ozone) layer keeps harmful levels of UV radiation from reaching earth’s surface. “Stratos” means “layer” . • Mesosphere – meteors burn up in this layer. “Mesos” means “middle”. Temp. here is about –130 ºF. • Thermosphere – extends out into space with no definite outer limit.
    • 11. Atmosphere (Cont.)Atmosphere (Cont.) • Ionosphere – lower layer of the Thermosphere. The sun’s energy tickles little ions and molecules in this layer causing them to glow which creates the Aurora Borealis or the “Northern Lights”. • Exosphere – “Exos” means outer so this layer is the outermost layer of our atmosphere. Satellites travel in this region of space.
    • 12. Air PressureAir Pressure • Air pressure – is the result of the weight of a column of air pushing down on an area. The column of air above your desk to the top of the atmosphere weighs about as much as a school bus.