3. The atmosphere is the Key symbol of global Interdependence.

4. One thing that makes life Possible on Earth is its Atmosphere. The atmosphere is a thin Layer of gases that Surround the planet.

5. The atmosphere is 78% Nitrogen and 21% oxygen. The remaining 1% is a mixture Of water vapor, argon, And a bunch of other stuff. We call the entire mixture Air.

6. The most important gases in The air for living organisms Are oxygen and Carbon dioxide. Most of the oxygen in the air Is due to early organisms Cresting it with Photosynthesis.

7. There are 5 major layers To the atmosphere… The Troposphere The Stratosphere The Mesosphere The Thermosphere The Exosphere

8. The troposphere extends to About 10 km above the earth. It contains nearly 90% of All the air in the atmosphere. This is also the layer where All the weather occurs.

9. The stratosphere extends From 10km to about 50km Above the earth. The air in this layer is Much less dense. Commercial airliners usually Travel in the lower part of This layer in the jet stream.

10. The stratosphere contains The ozone layer which Protects us from UV rays. After the stratosphere The layers extend farther And get thinner.

12. Weather is simply what is Happening in the atmosphere At a particular place At a particular moment.

13. Climate on the other hand Is the average weather in An area over a long period Of time. Climate is determined by a Variety of factors, including Latitude, air circulation, Ocean currents and Local geography.

14. Wind is caused by uneven Solar heating of the Earth’s surface. Warm air rises and cold Air sinks which causes Changes in pressure which Causes the winds.

15. Ocean currents have a Great effect on climate Because water holds a Large amount of heat. Oceans tend to make climates More moderate, so coastal Areas usually have warmer Winters and cooler summers.

16. The greenhouse effect is When the earth radiates Heat into space and it is Reflected back by the Atmosphere and the clouds.

17. The greenhouse effect of The atmosphere is the reason That the earth is warm Enough to sustain life. If the planet had no Greenhouse effect, the Average temperature would Be -18°C!

19. Not every gas in our Atmosphere traps heat. The gases that do trap heat Are called greenhouse gases. These gases are water vapor, Carbon dioxide, cfc’s, methane And nitrous oxide.

20. If you remember from the Inconvenient truth, al gore’s Teacher Charles Keeling First made the relation Of carbon dioxide and Warming of the earth.

22. Where is the extra carbon Dioxide coming from? A bunch comes from living Things, even more comes from Volcanic eruptions, but An obvious trend shows That burning from the industrial Revolution Increased it even more.

23. Most scientists think that as A result of increasing Greenhouse gases, the Average temperature of the Earth is increasing. This is called global warming.

24. Global warming will Disrupt weather patterns Which will also change Agriculture and raise Sea levels.

25. The best way to slow this Global warming is to try To reduce the amount of Carbon dioxide in the air. So conserve energy, drive Less, and plant trees. Earth Day Footprint Quiz

26. Show the global Climate change videos!

27. The ozone is a form of oxygen With molecules made Of 3 oxygen atoms.

28. In 1985 an article published In NATURE reported the Results of scientists working In Halley Bay, Antarctica. The study revealed that Between 50 and 98% of the Ozone had thinned.

29. The results were confirmed By NASA from information Acquired in 1979. The goal now was to find out What was eating the ozone.

30. It turned out that the answer Was CFC’s. (Chlorofluorocarbons) They were used in Styrofoam, Refrigerators, and Spray cans.

32. So in 1987 a group of nations Got together at the Montreal Protocol and Agreed to stop using CFC’s. Since then, the ozone hole Has started to heal itself!