Earth Science

1. Ch. 1
Sec. 3
Layers of the
Atmosphere

2. Layers of the atmosphere are
classified by changes in temp.

4. troposphere
• lowest layer
• from 0 
12 km
• we live in it

5. Weather occurs in the
troposphere.

7. stratosphere
• 12  50 km
• absorbs UV radiation
• ozone layer
• weather balloons

9. mesosphere
• 50  80 km
• meteors burn up
• coldest part of atmosphere

10. Most meteoroids burn up in the
mesosphere.

12. thermosphere
• outermost layer
• 80 km  to outer space
• no definite outer limit
• divided into 2 layers:

13. 1. ionosphere
lower layer
aurora borealis

14. AURORA BOREALIS

18. Communication satellites orbitCommunication satellites orbit
Earth in the exosphere.Earth in the exosphere.

19. 2. exosphere= outer layer
satellite

21. AURORA
BOREALIS
thermosphere
(ionosphere)

22. stratosphere
•absorbs UV
radiation

23. troposphere
•lowest layer
•we live in it

24. mesosphere
•meteors burn up

25. stratosphere
•ozone layer

26. mesosphere
•coldest part of
atmosphere

27. thermosphere
(exosphere)= outer layer
satellite

28. Weather occurs in the
troposphere.

29. Communication satellites orbitCommunication satellites orbit
Earth in theEarth in the exosphereexosphere
(thermosphere).(thermosphere).