1. Atmosphere

2. What makes up our atmosphere?  Nitrogen  Oxygen  Argon

3. Nitrogen Cycle

4. Atmospheric Pressure  There is less air at higher altitudes.  Force of 10 Newtons at Sea Level

5. Atmospheric Pressure  As altitude INCREASES  Air Pressure DECREASES DECREASES

6. Temperature  Varies with increase in altitude  Why?  Solar energy absorption varies as it moves down through the atmosphere.

7. Troposphere  Layer closest to the Earth –Almost all water vapor and CO 2  Temperature DECREASES  Tropopause is the upper boundary –It varies with latitude

8. Stratosphere  From tropopause to 50 km –Contains almost all ozone  Temperature INCREASES  Stratopause is the upper boundary

9. Mesosphere  From 50-80 km –Coldest layer  Temperature DECREASES  Mesopause is the upper boundary

10. Thermosphere  N and O absorb solar energy  Temperature INCREASES  2 Layers –Ionosphere- lower region –Exosphere- upper region

11. Tropopause Stratopause Mesopause Exosphere Troposphere Stratosphere Mesosphere Thermosphere Ionosphere