The Atmosphere
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The Atmosphere

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The Atmosphere The Atmosphere Presentation Transcript

  • The Atmosphere
  • The atmosphere is the blanket of air that surrounds the Earth.
  • The Earth System
  • Composition of the Air Nitrogen 78% Oxygen 21% Other gases 1% *greenhouse gases: carbon dioxide, water vapor, methane, etc.
  •  
  • Layers of the Atmosphere
    • Troposphere
    • Stratosphere
    • Mesosphere
    • Thermosphere (ionosphere)
  • The Troposphere
    • the bottom layer of the atmosphere
    • stretches to about 11 km
    • temperature decreases with altitude
    • where weather conditions happen
    • with vertical air currents (turbulent)
    • contains 75% of the air
    • mostly N 2 and O 2
  • Temperature Graph
  • The Stratosphere
    • the second layer of the atmosphere
    • up to about 50 km
    • with horizontal air currents
    • temperature increases with altitude
    • contains the ozone ( O 3 ) layer in the upper region
    • where most jet planes travel through
    • contains about 24% of the air
  • Temperature Graph
  • The Mesosphere
    • the third layer of the atmosphere
    • up to about 80 km
    • temperature decreases with altitude
    • the coldest layer
    • where most meteors burn up
  • Temperature Graph
  • The Thermosphere (Ionosphere)
    • the fourth layer of the atmosphere
    • to about 1000 km
    • the hottest layer (due to ions, H + and He - , that directly absorb the sun’s radiation)
    • temperature increases with altitude
    • where radio waves are reflected
  • Temperature Graph
  • Importance of the Atmosphere
    • provides the necessary gases for living things to survive
    • regulates the heat from the sun to just the right temperature for life on Earth
    • plays an important role in the water cycle
    • the ozone layer protects the Earth from the sun’s harmful UV rays
    • protects the Earth from small meteors
  • Points to Ponder
    • What is air pollution? Where does it come from?
    • How does air pollution affect us?
    • What can we do about air pollution?
    • What is the Clean Air Act all about?
  • Let’s summarize…
  • Identify the layer of the atmosphere being described:
    • 1. Composed of hydrogen and helium.
    Thermosphere
  • Identify the layer of the atmosphere being described:
    • 2. Most affected by air pollution.
    Troposphere
  • Identify the layer of the atmosphere being described:
    • 3. Protects the organisms from the
    • harmful rays of the sun.
    Stratosphere
  • Identify the layer of the atmosphere being described:
    • 4. Contains the most dense air.
    Troposphere
  • Identify the layer of the atmosphere being described:
    • 5. Contains the least dense/thinnest air.
    Thermosphere
  • Identify the layer of the atmosphere being described:
    • 6. Coldest layer of the atmosphere.
    Mesosphere
  • Identify the layer of the atmosphere being described:
    • 7. Contains ozone (O3).
    Stratosphere
  • Identify the layer of the atmosphere being described:
    • 8. Where meteors burn up.
    Mesosphere
  • Identify the layer of the atmosphere being described:
    • 9. Where air planes and jet planes fly.
    Stratosphere
  • Identify the layer of the atmosphere being described:
    • 10. Where weather changes happen.
    troposphere
  • True or false:
    • 1. Nitrogen (N 2 ) gas is the most abundant gas in the atmosphere.
    True
  • True or false:
    • 2. Methane (CH 4 ) is not a greenhouse gas.
    False
  • True or false:
    • 3. Thermosphere and Mesosphere are the hottest layers of the atmosphere
    False
  • True or false:
    • 4. Air pressure is highest in the troposphere layer.
    True
  • The End