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#Earth's atmosphere

7 public questions tagged with this topic.

Environmental Effects - Ozone, Greenhouse and Safety

What protects the Earth from excessive ultraviolet radiation?

**Ozone absorbs UV** protecting life, depletion by CFCs, halons produces Cl· + O₃ → ClO + O₂, ClO + O → Cl· + O₂, catalytic cycle, one Cl destroys thousands of O₃, Montreal Protocol bans CFCs, UV increase harmful. The document mentions that the ozone layer absorbs most ultraviolet radiation from the sun at an altitude of 40-50 km . Using c = fλ, E₀/B₀ = c, I_d = ε₀ dΦ_E/dt, and spectrum classification λ = c/f, evaluation yields Ozone layer, illustrating EM wave transverse nature and Maxwell's displacement current concept.

Ref: NCERT > Physics Book > Electromagnetic Waves > Environmental Effects - Ozone, Greenhouse and Safety

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Basic Evolution

Main source of atmospheric oxygen was:

Photosynthesis reflects key principle in quiz on section b solved pyqs, where evolutionary mechanisms shape genetic variation and adaptation. In this context, Photosynthesis aligns with experimental and theoretical evidence from population genetics, behavioral ecology and molecular phylogeny. Textbooks like Campbell Biology, Futuyma Evolution and Hartl Principles illustrate supporting data. Understanding why Photosynthesis fits helps integrate natural selection, environment.

Ref: Futuyma, Evolution, Drift and Speciation PYQs.

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ORIGIN OF LIFE

Main source of atmospheric oxygen:

Photosynthesis reflects key principle in quiz on section b pyqs- origin of life, where evolutionary mechanisms shape genetic variation and adaptation. In this context, Photosynthesis aligns with experimental and theoretical evidence from population genetics, behavioral ecology and molecular phylogeny. Textbooks like Campbell Biology, Futuyma Evolution and Hartl Principles illustrate supporting data. Understanding why Photosynthesis fits helps integrate natural selection, environment.

Ref: Miller & Lazcano, J Mol Evol, Prebiotic Chemistry and RNA World.

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Applied Ecology

What is the most abundant gas in the Earth's atmosphere by volume?

Dry air consists of about 78.08% nitrogen by volume, approximately 20.95% oxygen, 0.93% argon, and only about 0.04% carbon dioxide. Nitrogen therefore dominates the atmosphere quantitatively. Its abundance reflects the stability of molecular nitrogen, whose strong triple bond limits rapid biological or chemical removal, although nitrogen-fixing organisms make part of it biologically available. Atmospheric inversions can trap contaminants near the surface, while wind, turbulence, precipitation, and chemical transformation determine their eventual distribution and removal. At organismal level, r

Ref: Campbell Biology, Urry et al., 12th Ed., Unit 8 Ecology

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