3. What is the Atmosphere? A blanket of gases surrounding the Earth

4. Why is the atmosphere important? Makes Earth suitable for life Moderates Temperature Water Keeps out harmful rays from sun & space

5. Make a Prediction Is the atmosphere thick or thin compared to the radius of the earth? The atmosphere is very thin!! Analogy If the earth was an apple the atmosphere would be the skin...

6. The Atmosphere is divided into 5 different layers 1.Troposphere: 0-10km 2.Stratosphere: 10-50km 3.Mesosphere: 50-100km 4.Thermosphere: 100- 500km 5.Exosphere: 500-700km

8. What keeps the atmosphere around the Earth? GRAVITY!!! FACT: 80-90% of the atmosphere is found in the Troposphere..

10. ANY QUESTIONS?

12. What is the composition of the Atmosphere? Gases & Particles

13. What do you think… Has the concentration of gases changed over time?? Yes, concentration of gases have changed over time and vary form place to place.

14. Atmospheric Gases & Particles N2,O2= 97-99% H2O Vapor= 0.0-4.0% Ar= 1%CO2= 0.03% Trace Gases= 0.01% Particulate Matter: mixture of solids & aerosols dust, water droplets, smoke, ash, wind erosion

16. Sources of Atmospheric Gases and Particulate Matter Natural vs. Volcanoes Forest Fires Plants Decaying Plants Landscape Soil Oceans Anthropogenic Fossil Fuels Transportation Power plants Industrial

17. ANY QUESTIONS?