1. Drop everything and read!

2. Warm Up Quiz In your notes section, draw a picture that looks like a simple mountain

3. Write in your notebook Altitude: the height above sea level As altitude increases density decreases As altitude decreases density increases Density: the amount of mass in a given volume of air In notes from last class THINK: air molecule Measuring Mercury barometer: uses liquid to measure air pressure Aneroid barometer: uses a spring to measure air pressure

4. Air Pressure and Density Review How does air pressure change with temperature?

5. Air Pressure and Density Review Where is air pressure the greatest? The least? Where in the atmosphere is the air most dense? Least dense?

6. Word meanings Tropo means “turning” Strato means “spreading out” Meso means “middle” Thermo means “heat”

7. Troposphere FACTS Layer closest to Earth’s surface 80% of the atmosphere’s mass is here This is where weather occurs Warmed from the ground below Temperature decreases as you go up! Altitude 0-6 miles

8. Stratosphere FACTS Airplanes fly here Contains the ozone The gases in the ozone trap heat Temperature increases at you go up! Altitude 6-31 miles

9. Mesosphere FACTS Air is extremely thin! Less than.1% of the atmosphere’s mass Meteors are burnt up here Temperature decreases as you rise Altitude 31-56 miles

10. Thermosphere FACTS Starts at 56 miles and goes into outer space Air molecules become very hot because of solar radiation Two minor layers (Ionosphere and the Exosphere) The temperature increases as you rise! Altitude: 56 miles and up!

11. Any questions?

12. Mr. Lee’s Rap Mr. Lee - Layers of the Atmosphere rap - YouTube