1. Earth’s Atmosphere Composition and Natural Cycles

2. Atmosphere makes life possible: Living things use gases Keeps earth warm. i.e Global Warming Protects life

3. Characteristics of the Atmosphere Becomes thinner as altitude increases Density decreases as altitude increases The weight of the atmosphere is closer to Earths surface

4. Materials in the Air Most materials are gases Dust, saltwater, and vapors are present in the air Nitrogen 78% Oxygen 21% Oxygen 21% other gases 1% other gases 1%

5. Construct a Pie Graph

6. Gases in the atmosphere

7. Classwork Use pg 12A-13A Write 2-3 facts about each cycle to reference each picture. No additional time will be given to complete the assignment, so you must work hard!!

8. Reflection Write a summary about what you have learned about todays lesson. Please complete on the bottom of SIN pg 3. It will be included on the notebook check.