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Bell Work Get out your notebooks for notes

Learn about the Earth's atmosphere, its layers, composition, and essential functions. Discover why the atmosphere is crucial for life on Earth and how it regulates temperature. Explore the different layers and their unique characteristics.

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Bell Work Get out your notebooks for notes

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  1. Bell Work Get out your notebooks for notes What do we mean when we talk about our atmosphere? How high up into the sky does the our atmosphere go? What is our atmosphere made up of?

  2. Atmosphere - 1

  3. What is The Atmosphere? • Atmo (vapor or air) + sphere (orb) • Layer of gases surrounding Earth • Where weather occurs • Essential for life • Keeps Earth warm

  4. Argon 0.9% CO2 0.03% Other ~0.07% Contents of our air: O2 21% Nitrogen 78%

  5. Oxygen:All living organisms require Carbon Dioxide: Required for photosynthesis; keeps the Earth warm photosynthesis

  6. Nitrogen: All living organisms need for proteins & DNA; the atmosphere is Earth’s nitrogen reservoir

  7. Other components in the air: 1. Water Vapor • Occurs as clouds. • Absorbs solar energy.

  8. 2. Ozone Layer: • Made up of O3 molecules • 10-50 km above Earth • Absorbs harmful UV radiation Without CO2 and ozone the average temperature on Earth would be -6o C

  9. 3. Atmospheric Solids • Salt from sea spray and dust • Condensation nuclei: form when dust & salt attract water vapor; leads to clouds, hail & snow formation

  10. Heat on Earth comes from solar radiation that is … Absorbed by Earth Scattered back to Earth by CO2, H2O, and other gases in the air

  11. Layers of the Atmosphere • Characterized by distance from Earth & temperature • Further from Earth, there are fewer molecules in the air – pressure ↓, the air is “thinner”

  12. Troposphere • To ~16 km high • Temp. ↓with distance above Earth • Most weather happens here • Most pollution is trapped here

  13. Stratosphere • From 16 - 50 km • Most ozone is here • Temp. ↑ with height because of ozone • Very little water vapor

  14. Mesosphere • From 50-80km • Temp. ↓ as you rise • No Ozone • Very thin air (few molecules)

  15. Thermosphere • Beyond 80 km • Temp. ↑ with height (more solar rays absorbed) • Air very thin –won’t feel hot • Aurora occurs here

  16. Aurora Borealis: Particles from the Suns solar winds interact with the magnetic field of the Earth to form the Aurora.

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