The document summarizes key aspects of Earth's atmosphere. It describes the atmosphere as a layer of gases surrounding the Earth composed primarily of nitrogen, oxygen, and argon. It also notes the presence of varying amounts of water vapor, ozone, and particulates. Additionally, it outlines atmospheric pressure and layers including the troposphere, stratosphere, mesosphere, and thermosphere, providing details on temperature variations and composition within each layer.

2. ATMOSPHERE:
Layer of gases that surround the Earth

3. COMPOSITION:
78% Nitrogen
21% Oxygen
.9% Argon
.1% Other Gases

4. ATMOSPHERIC PARTICLES:
• Water Vapor – from evaporation and
transpiration, ranges from 1% (dry) to 4%
(moist)
• Ozone – O3, absorbs harmful UV radiation,
being destroyed by particulates
• Particulates – tiny solid particles such as ash,
dust, pollen, microscopic organisms

5. ATMOSPHERIC PRESSURE:
• The pressure exerted on a surface by the
atmosphere
• Decreases as altitude increases
• Measured using a barometer

6. LAYERS OF THE ATMOSPHERE:
a) Troposphere
b) Stratosphere
c) Mesosphere
d) Thermosphere

7. TROPOSPHERE:
• Closest layer to the Earth
• Where the weather is found
• Temperature decreases as altitude increases
because its heated by Earth’s surface

8. STRATOSPHERE:
• Almost all the ozone (including ozone layer) in
this layer
• As altitude increases temperature increases
because UV rays absorbed by ozone

9. MESOSPHERE:
• Temperature decreases as altitude increases
• Coldest layer

10. THERMOSPHERE:
• As altitude increases temperature increases
because oxygen and nitrogen atoms absorb
solar radiation