1. 05 - The Atmosphere The Air that surrounds the earth is called the atmosphere.

2. Air Air is a mixture of _____________________________________________. It occupies ________ and has ___________. About 78 % of air is __________________ 21% is ____________ 1 % is composed of _____________________________, and tiny amounts of other gases.

3. Composition of Air Chart

4. Parts of the Atmosphere The atmosphere can be divided into five layers. Each layer is determined by height and temperature increase or decrease.

5. Troposphere ( TROHP uh sfihr ) First Layer Extends from the ground to about _____________________________________________. Temperatures drop about 6.5 o C for each kilometer of _____________________________________________. Almost all ______________________ occurs in this layer.

6. Stratosphere ( STRAT uh sfihr ) Second layer Extends from about _______________________ above the earth. Temperature __________________________________________ At 50km, the temperature is about 7 0 C The air is ____________________________________________ ________________is also produced here. –Form of oxygen that absorbs harmful ultraviolet rays. Many ___________________ here because it is _____________.

7. Mesosphere ( MEZ uh sfihr ) Third layer Extends from about ______________________. The temperature ________________________________. At the top of the mesosphere the temperature is _______________________. _____________________________ burn up in this layer.

8. Thermosphere ( THUR muh sfihr ) Fourth Layer Extends from _____________________ above the earth. Temperature _________________ and may reach 700 0 C. Layer with ___________________________________ and where the ________________________________.

9. Exosphere ( EK SO sfihr ) The layer of the atmosphere farthest from the earth. Starts at the altitude of about _____________________________________________. Eventually blends _______________________________.

10. Ionosphere Consists of the ______________________________________________ _____________________________________________. Absorbs a large amount of ________________________. The radiation changes ___________________________. The Ionosphere aid in ______________________________________________ ______________________________________________.