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The Atmosphere. THE ATMOSPHERE. Definition: Atmosphere. Air that surrounds the earth Composed of: Nitrogen 78% Oxygen 21% Misc. Gases (water vapor, argon, etc… 1%). How did it form?. THEORY ………. As earth cooled, released gases from the earth’s interior

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the atmosphere

The Atmosphere

THE ATMOSPHERE

definition atmosphere
Definition: Atmosphere
  • Air that surrounds the earth
  • Composed of:
    • Nitrogen 78%
    • Oxygen 21%
    • Misc. Gases (water vapor, argon, etc… 1%)
how did it form
How did it form?
  • THEORY ……….
  • As earth cooled, released gases from the earth’s interior
  • Not the same composition as today’s atmosphere
benefits of atmosphere
Benefits of Atmosphere
  • Provides gases necessary for life (oxygen, carbon dioxide)
  • Protects us from majority of suns harmful UV radiation
  • Allows light to reach surface for energy and photosynthesis
  • Radiates some heat back to Earth, therefore warming the planet
layers
Layers
  • Defined by changes in temperature
  • Troposphere
    • tropopause
  • Stratosphere
    • stratopause
  • Mesosphere
    • mesopause
  • Thermosphere
troposphere1
Troposphere
  • 0-12 km
  • Where we live
  • Weather occurs here
  • As height increases, temperature decreases
  • Temperature drops ~ 6.50 C/km above Earth’s surface
  • Greatest amount of air pressure (weight of air above)
tropopause
Tropopause
  • Top of troposphere
  • Temperature fairly constant
  • Separates troposphere from stratosphere
  • Where jet stream is
    • Very strong winds that blow eastward
stratosphere1
Stratosphere
  • 12 – 50 km
  • Lower part’s temperature is constant (~60oC)
  • Contains ozone layer
  • People can’t breathe in this layer
  • Lowest part of stratosphere there is less turbulence so where commercial airlines usually fly!
ozone layer
Ozone Layer
  • Earth’s shield
  • Protects Earth’s surface from the sun’s harmful UV radiation
  • It absorbs the sun’s UV radiation
  • Causes an increase in temperature in upper part of stratosphere
mesosphere
Mesosphere
  • 50 – 80 km
  • Temperature decrease to -100oC
  • Coldest region of atmosphere
    • This is due to the gases in this layer can’t absorb any of the suns energy (therefore, really cold)
  • Protects earth from ‘meteorites’
  • Meteorites burn up in this area creating “shooting stars” effect
thermosphere1
Thermosphere
  • 80 km and up
  • Air very thin
  • Temperaturesvery high because of sun’s intense UV radiation
  • Temps can be >2000oC
  • Has 2 sub-layers
    • Ionoshpere
    • exosphere
ionosphere
Ionosphere
  • 80 km – 550 km
  • Contains charged “ionic” particles
  • Where radio waves are bounced back from
exosphere
Exosphere
  • > 550 km.
  • Air extremely thin
  • Area where satellites orbit
  • Enter space once exit exosphere
magnetosphere
Magnetosphere
  • Earth’s magnetic field
  • Causes Northern Lights
assignment
Assignment
  • Create a foldable of the layers of the atmosphere.
  • READ AND FOLLOW THE DIRECTIONS !!!! DO THIS STEP BY STEP !