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10. ozone is beneficial for us as it:a. absorbs infrared radiationsb. absorbs ultraviolet radiationsc. absorbs chlorofluorocarbonsd. absorbs air pollutants

10. ozone is beneficial for us as it:a. absorbs infrared radiationsb. absorbs ultraviolet radiationsc. absorbs chlorofluorocarbonsd. absorbs air pollutants

11. which one of the following is not an air pollutant?a. nitrogenb. carbon monoxidec. nitrogen dioxided. ozone

11. which one of the following is not an air pollutant?a. nitrogenb. carbon monoxidec. nitrogen dioxided. ozone

5. the earths atmosphere is getting hotter because ofa. increasing concentration of b. increasing concentration of _{2} c. increasing concentration of d. increasing concentration of

5. the earths atmosphere is getting hotter because ofa. increasing concentration of b. increasing concentration of _{2} c. increasing concentration of d. increasing concentration of

4. a group of gases that maintains temperature of atmosphere is:a. carbon dioxide and water vapoursb. nitrogen and carbon dioxidec. oxygen and water vapoursd. nitrogen and oxygen

4. a group of gases that maintains temperature of atmosphere is:a. carbon dioxide and water vapoursb. nitrogen and carbon dioxidec. oxygen and water vapoursd. nitrogen and oxygen

6. which one of the followings is not a greenhouse effect?a. increasing atmospheric temperatureb. increasing food chainsc. increasing flood risksd. increasing sea-level

6. which one of the followings is not a greenhouse effect?a. increasing atmospheric temperatureb. increasing food chainsc. increasing flood risksd. increasing sea-level

3. state the major sources of and _{2} emission.

3. state the major sources of and _{2} emission.