Main constituent in air is ___________?
Correct answer: B. Nitrogen
- A. Oxygen
- B. Nitrogen
- C. Hydrogen
- D. Helium
Explanation
Nitrogen makes up about 78% of dry air, making it the main constituent. Oxygen is second at about 21%, while hydrogen and helium occur only in trace amounts.
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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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