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Earth's atmosphere

Earth's atmosphere




Contract 25



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    Earth's atmosphere Earth's atmosphere Presentation Transcript

    • Earth’sAtmosphere
    • Earth’s Layers• Troposphere• Stratosphere• Mesosphere• Thermosphere• Exosphere
    • Troposphere Statistics• Nearest to the Earth• Anywhere from 5-11 miles thick• Contains 99% of Earth’s water vapor• Water vapor and temperature decrease with height• Composition – 78% Nitrogen, 21% Oxygen, .9% Argon, .3-4.0% Water Vapor, .04% Carbon Dioxide
    • Troposphere Conditions• Temperature decrease as altitude increases – This is because the ground absorbs the sun’s energy, so it heats the lower areas.• Clouds form in this layer, which affect the weather. This is the layer we live in, so this is the weather we have.
    • Stratosphere Statistics• Holds 19% of the atmosphere’s gases, but very little water vapor• It is about 30 miles up from the surface
    • Stratosphere Conditions• Temperature increases with height – Heat is produced when ozone is formed. The heat changes from around -61°F to a maximum of 5°F – The temperature increase means that warmer air is on top of cooler air. Because of this, there is no convection since there isn’t any upward movement of gases• This layer absorbs high energy UV rays from the sun, and then breaks it down into oxygen
    • Mesosphere Statistics• It has an altitude of about 56 miles• Gases continue to get thinner and thinner as the altitude increases• Even though the gases are thinner, they are still thick enough to slow meteors down in the atmosphere, where they burn up
    • Mesosphere Conditions• The warming effect of ultraviolet radiation becomes less and less. This causes the temperature to decrease with height.• The temperature decreases from about 5°F to around -184°F
    • Thermosphere Statistics• It has an altitude of about 375 miles above earth’s surface• The gases are really thin – This causes ultraviolet and x-ray radiation from the sun to be absorbed by the molecules and cause a big temperature increase
    • Thermosphere Conditions• Temperature increases with height• Can reach 3,600°F near the top of the layer• Even though it’s that hot, it would still feel cold to our skin because of the extremely thin air
    • Exosphere Statistics• Outermost layer in our atmosphere• Extremely thin air• Starts at about 434 miles above the surface and extends out into space
    • Exosphere Conditions• Very warm• Gravity and pressure are really weak, so atoms are able to drift off into space