Thickness of atmosphere is:
Correct answer: C. 1000 km
- A. 100 km
- B. 500 km
- C. 1000 km
- D. 1500 km
Explanation
The layer of gases surrounding the earth is called atmosphere. It consists of various gases in different proportions i.e., N2 (78%), O2 (21%), Ar (0.9 %), CO2 (0.03 %) and trace amounts of H2, O3, CH4, CO, He, Ne, Kr and Xe. It also contains varying amounts of water vapours. Its thickness is about 1000 km above the surface of the earth and half of its mass is concentrated in the lower 5.6 km.
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Atmospheric pollution includes smog, acid rain, greenhouse gases, ozone depletion and the effects of carbon monoxide, sulfur oxides, nitrogen oxides and particulate matter. Water pollution covers sewage, industrial waste, eutrophication and treatment stages, while green chemistry focuses on reducing hazardous substances, waste and energy use through safer, more efficient processes.
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