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Atmosphere
• The atmosphere is a very thin layer of
gases wrapped around the earth.
Green House Gases
• The earth’s atmosphere contains gases that trap
heat from the sun.
• The trapped heat cause the Earth to warm.
• Such gases include water vapor, carbon dioxide,
methane, nitrous oxide, ozone, and
chlorofluorocarbon (CFCs).
Methane
Fluorocarbon
Nitrous
Oxide
Carbon Dioxide
Green House Gases
• Carbon Dioxide, CO2 ,is a transparent, non inflammable
gas that is recycled by the atmosphere through
photosynthesis.
• Methane, is a colorless, odorless, flammable gas. It is
formed when plants decay.
• Nitrous Oxide gas is colorless, but has a sweet smell.
This compound is released by the ocean and by bacteria
in soil.
• Fluorocarbons is a general term for any group of
synthetic organic compounds that contain fluorine and
carbon.
Earth
• The Earth has just the right amount of
green house gases to survive.
• Too much gases will make the Earth too
warm to live in, as in the case of Venus.
• Too little gases will cause the Earth to
become too cold for life. An example of
this is Mars.
Planets Orbiting The Sun
Goldilocks Principle
• It is used to state that a planet must
neither be too far away nor too close to the
sun to support life.
• Venus is too hot, Mars is too cold, but
Earth is just right.
Atmospheric Factors Responsible For The
Planetary Difference
Chemical Composition of the Atmospheres
References
http://www.ucar.edu/learn/1_1_1.htm
http://www.pbs.org/wgbh/nova/ice/greenhouse.html
http://www.umich.edu/~gs265/society/greenhouse.htm