atmosphere and its layers

a complete introduction of atmosphere including its composition its layers its applications etc

1. (ecology) Presented by: Syeda jaweria rehman Presented to: Mam Sajida Roll no:1701732

2. The atmosphere is the blanket of air that surrounds the earth

3. C omposition Atmosphere is a mixture of Gases Dust Water vapor Clouds and precipitation (rain) Absorbs heat and energy from the sun

4. structure of atmosphere Atmospheric layers

5. Why is the atmosphere divided into 4 different layers? Any guesses? The atmosphere is divided into five different layers because the atmosphere is not uniform, its properties change with altitude. Two properties change with altitude, the AIR PRESSURE and the AIR TEMPERATURE Lets look at each layer individually .

6. The Troposphere

7. Layers of Atmosphere Troposphere Lowest and thinnest layer 12-20km at equator, 8-10km at poles 10-12km moderate latitudes 90% of the atmosphere’s mass Temperature decreases with altitude 6°C per kilometer Top of troposphere averages -60°C Where weather occurs Boundary between the troposphere, and the stratosphere is called the tropopause View of troposphere layer from an-airplane's window.

8. The stratosphere

9. Stratosphere Extends from 20 km to 50 km above the ground Less dense (less water vapor) Temperature increases with altitude to 0°c Almost no weather occurrence Contains high level of ozone Ozone layer Upper boundary is called stratopause .

10. The Mesosphere

11. Mesosphere Extends to almost 80 km high Gases are less dense. It stop meteors to enter into lower layers Temperature decreases to -100 ͦ c as altitude increases . Gases in this layer absorb very little UV radiation.

12. The T hermosphere

13. Thermosphere Above the mesosphere and extends to almost 550 km high Temperature increases With altitude Readily absorbs solar radiation Temperature can go as high as 1,500°C Reflects radio waves

14. Thermosphere

15. FUNCTIONS OF ATMOSHERE

16. FUNCTIONS Protection of all life form dangerous sun rays Allows sunlight in Protects from drastic temperature variation(insulates earth) Transport energy and water vapor Stores nitrogen and carbon dioxide(for plants)and oxygen (for animals) Protect from smaller meteorites

17. REFRENCES Composition of atmosphere https :// www.britannica.com/science/atmosphere https://climate.ncsu.edu/edu/Composition