- Seasonal reversal of winds
- Revolution of earth
- Movement of clouds
- Rise in temperature
- Seasons
- Atmosphere
- Air and sounds
- Winds and clouds
- Shine Silver
- Quick Silver
- Slow Silver
- Slippery Silver
- ozone accumulation
- ozone depletion
- acid rain
- allergens
- electron
- energy quanta
- photon
- positron
- increasing focal length of the lens
- Decreasing focal length of the lens
- Lens of large aperture
- lens of short aperture
- Magnesium and Lead
- Aluminium and Zinc
- Aluminium and Magnesium
- Aluminium and Mercury
- concave
- Convex
- diverging
- none of these
- Nitrogen + Hydrogen
- Nitrogen + Carbon
- Nitrogen + Oxygen
- Oxygen + Carbon
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