The blueness of the sky is mainly due to _____________?
Correct answer: B. The scattering of sunlight by air molecules
- A. The presence of water vapor
- B. The scattering of sunlight by air molecules
- C. Absorption of blue light by the air
- D. Emission of blue light by the atmosphere
Explanation
Air molecules scatter short-wavelength blue light more strongly than longer-wavelength red light, so scattered blue light reaches the observer from all directions. Water vapour is not the main cause of the sky's blue colour.
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Environmental science covers ecosystems, food chains and webs, energy flow, biogeochemical cycles, biodiversity, natural resources and population effects. Atmospheric study includes the layers and composition of air, weather and climate, greenhouse gases, global warming, ozone depletion, acid rain and pollution, with climate change distinguished from ordinary weather variation.
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