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ChapD1.1

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Earth's Atmosphere

Earth's Atmosphere

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  • 1. Earth’s Atmosphere
  • 2. The Air You Breathe
    • atmosphere: the layer of air that surrounds our planet
      • atmosphere looks like a thin blanket surrounding the entire planet
      • formed when gases from erupting volcanoes collected around the planet millions of years ago
        • gases would have poisoned people but bacteria and other living things used these gases and released new gases
        • the gas mixture changed slowly over time until it became the atmosphere we have now
  • 3.
    • atmosphere made of billions and billions of gas particles
      • about 4/5 of these gas particles are nitrogen (N)
      • 1/5 are oxygen (O)
        • oxygen: a gas that your body uses in its life processes
      • carbon dioxide (CO2) and water vapor make up the rest of the atmosphere
        • plants use CO2 during photosynthesis
        • plants give off O as photosynthesis occurs
        • CO2 absorbs heat energy from the sun and Earth’s surface
          • this helps keep the planet warm
  • 4.
    • water vapor can absorb heat energy
      • amount of water vapor in the air varies from place to place
      • air over bodies of water have more water vapor
      • high in the air water vapor changes to clouds
  • 5.
    • properties of air
      • takes up space
      • has weight
      • air pressure: all the particles if air pressing down on the surface
        • changes as you go higher in the atmosphere
        • at the surface particles are close - the further you to into the atmosphere the farther apart the particles are
        • less air pressure the higher the atmosphere
  • 6. Atmosphere Layers
    • atmosphere divided into 4 layers
      • troposphere: closest to Earth
        • we live in the troposphere and breathe air
        • almost all weather can happen here
        • air temp goes down as you go up
      • stratosphere: contains most of the atmosphere’s ozone, kind of O
        • airplanes travel in the stratosphere to avoid bad weather
        • ozone protects us from suns harmful rays
        • temps increase w/ height
  • 7.
      • mesosphere
        • temp decreases w/ height
        • coldest layer
      • thermosphere
        • hot, outermost layer
        • temp increases quickly w/ height
          • can reach thousands of degrees Celsius
  • 8. Summary
    • thin blanket of air surrounding Earth is the atmosphere
    • atmosphere divided into 4 layers based on temp changes
    • starting with closest to Earth the layers are: troposphere, stratosphere, mesosphere, and thermosphere