Layers of the Atmosphere Assignment# 13

1. Layers of the AtmosphereAssignment# 13 How do each of the layers of the Earth’s atmosphere compare to each other?

2. These are the layers in order from the Earth upwards • Troposphere • Stratosphere • Mesosphere • Thermosphere • Exosphere

3. The Troposphere • Lowest layer. • Weather occurs here and therefore clouds. • We live in it. • “Tropo” means turning or changing conditions. • Densest layer. • Temperature is warmer at the surface and decreases with altitude.

4. Troposphere: temperature at surface is warmed by the earth absorbing energy from the sun. Convection currents carry the heat upward, so the air cools as it rises. Density decreases since there is less air above. Temperature/Density and the Troposphere

5. The Stratosphere • “Strato” means layer or spreading out • Contains the ozone layer which absorbs energy and causes the temperature to rise. • The ozone layer protects the surface from dangerous UV rays (ultraviolet radiation from the Sun).

6. Ozone, made of oxygen, absorbs ultraviolet radiation from the sun, causing the temperature to increase. Density still decreases. Temperature and the Stratosphere

7. Drop in temperature marks beginning of mesosphere “Meso” means middle Most meteors burn up here The Mesosphere

8. This layer does not absorb energy from the sun, so it starts to cool again. Without greenhouse gases, energy pretty much passes straight through! Temperature and the Mesosphere

9. The Thermosphere • “Thermo” means heat • Very hot (over 1000°C), but since air is so thin (not very dense) it would not feel warm at all. • The space shuttle orbits here.

10. The Exosphere • “Exo” means outer • Extends for 1000’s of miles • Satellites orbit here • No definite edge • Molecules gradually escape out into space

11. Atmospheric gases • Two most common? • Nitrogen is the most common • Oxygen is the second most common • These gases are found throughout all the atmospheric levels.