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What is the atmosphere?. Warm Up. Why is the ATMOSPHERE important?. What is it?. What is the atmosphere and how have we discovered more about it? Video Clip. Weather. Weather is the condition of the earth’s atmosphere at a particular time and place So what is the atmosphere?.

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Presentation Transcript
what is it
What is it?
  • What is the atmosphere and how have we discovered more about it?
  • Video Clip
weather
Weather
  • Weather is the condition of the earth’s atmosphere at a particular time and place
  • So what is the atmosphere?
earth s atmosphere
Earth’s Atmosphere
  • A thin layer of gases that surrounds the planet
  • Makes conditions on earth suitable for living things
composition
Composition
  • Nitrogen – 78%
  • Oxygen – 21%
  • Carbon dioxide
  • Water vapor
  • Other gases
  • Particles of liquids and solids
nitrogen
Nitrogen
  • Most abundant gas in the atmosphere
  • 78% of the air we breathe
  • N2
  • Essential to living things – needed to grow and repair body cells
  • Bacteria convert nitrogen from the air and then plants use it to create proteins that people and animals need.
oxygen
Oxygen
  • Second most abundant gas in the air
  • Only 21% of the volume
  • Usually in the form of O2
  • Plants and animals use it
  • Important in other processes
  • Ozone (O3) – forms when lightning interacts with Oxygen
carbon dioxide
Carbon Dioxide
  • CO2
  • Only in small amounts - .036%
  • Essential to life – plants need it to make food
other gases
Other Gases
  • Called trace gases because only small amounts are present
water vapor
Water Vapor
  • Amount in the air varies from place to place
  • Plays an important role in the earth’s weather
  • Clouds, precipitation
particles
Particles
  • Pure air is only gases, but this exists only in a lab
  • In the real world, there are many different particles
    • Dust
    • Smoke
    • Salt
    • Other chemicals