THE+ATMOSPHERE

1.- The origin of the atmosphere 2.- The composition of the atmosphere 3.- The structure of the atmosphere 4.- The function of the atmosphere graph 5..Air pollution Global atmospheric problems and Environmental actions favorable for the atmosphere || **__ACTIVITIES:__** || media type="custom" key="28831260" || __to the existence of humans.__ __and reflected back by a layer of greenhouses gases ( carbon dioxide and water vapour)__
 * __**Unit 3. THE ATMOSPHERE**__
 * Composition and structure of the atmosphere
 * Questions about the functions of the atmosphere ||
 * [[file:Complete atmosphere layers and functions.ppt]]
 * [[image:http://www.beevoz.com/wp-content/uploads/2014/10/aurora-boreal.jpg width="421" height="222" caption="Aurora boreal"]] ||  ||
 * || [[image:third part.jpg width="800" height="1091"]] ||
 * == The Greenhouse Effect and the problem of Global Warming ==
 * __The greenhouse effect is a natural process and one that is vital__
 * Without the greenhouse effect the Earth will be colder (-15 degrees Celsius) and __unable to support life.__
 * The greenhouse effect acts as a kind of blanket.
 * As __energy is reflected or released by the Earth it moves into the atmosphere where it is trapped__
 * __carbon dioxide and water vapour__**
 * The reflected energy returns to Earth and is absorbed warming global temperatures.

The problem of __**global warming**__ __is caused by humans enhancing the greenhouse effect.__ __trapping an ever increasing amount of reflected or released energy which returns to Earth and warms us further.__
 * __We are releasing more greenhouse gases into the atmosphere which is__

in the thermal infrar**__ed range.__**
 * Greenhouse gasses (GHG):** Any gas that absorbs and emits radiation
 * __The gases include: carbon dioxide and water vapour__**

Sources of greenhouse gases include:
 * Transport (cars )
 * Burning fossils fuels (especially oil and coal)
 * Industry
 * Domestic use (wood fires) || ...................................................................... ||
 * [[image:http://static.howstuffworks.com/gif/global-warming-4.gif width="431" height="334" caption="external image global-warming-4.gif"]] || media type="custom" key="26901852" ||
 * == Problems Caused By Global Warming ==
 * == Problems Caused By Global Warming ==
 * == Problems Caused By Global Warming ==

impact of global warming, Rising sea levels itself will cause many impacts like loss of land, changes in ecosystems.
 * Rising Sea Levels: ** This is probably the best known

force and can destroy or breach even the strongest defences. In addition as sea levels rise, some defences become too small, it is believed that the Thames Flood Barrier designed to protect London will have to be enlarged in the future at enormous cost. ||  ||
 * Coastal Flooding (cost of defences): ** The sea is a powerful
 * [|The functions of the atmosphere] || [|Let´s play about the atmosphere] ||