2. WHAT I SEE… Four Interactive Systems HYDROSPHERE : All the water on Earth GEOSPHERE: Surface of the Earth BIOSPHERE: All organisms on Earth ATMOSPHERE: …..

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

4. 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

6. 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...

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

8. 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

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

10. 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

11. 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.

12. In Class Activity Write a short response.. How was the atmosphere formed???

13. Scientific Literacy Where would you look to find the answer?? Reliable Scientific Source http://astrobiology.nasa.gov/ask- an-astrobiologist/intro/ http://astrobiology.nasa.gov/ask- an-astrobiologist/intro/

14. The air around you importance of atmosphere Makes Earth suitable for life Moderates Temperature Water Keeps out harmful rays from sun & space

15. HOMEWORK Review notes and text pages 280-288 Quiz Tomorrow

16. Homework Read text p. 286-296 Write a short response.. How was the atmosphere formed???