QUESTION 14 The major source(s) of chlorofluorocarbons (CFCs) in the atmosphere

Question

QUESTION 14 The major source(s) of chlorofluorocarbons (CFCs) in the atmosphere was/were -. combustion of fossil fuels O microbial fermentation of organic matter in coal mines, oil wells and livestock burning of fossil fuels and coal O emissions from automobile exhaust and chemical fertilizers O refrigerants, solvents and spray propellants QUESTION 15 The primary cause of Earth's seasons is: O regular changes in radiation emitted by the Sun. O changes in atmospheric thickness. O varying distance from the Sun, which changes how much radiation Earth receives fron the Sun O varying orbital speed. O tilt of Earth's rotation axis, which causes sun angles and daylight length to vary QUESTION 16 The spring equinox in the Northern Hemisphere occurs on approximately O September 22. O January 3. O March 21. 0 December 21. June 21

Explanation / Answer

14. Main source of CFCs in the atmosphere was/were refrigerants, solvents and spray propellants. CFCs are chloroflurocarbons comprised of chlorine fluorine and carbon.

15. The primary cause of Earth's seasons is the tilt of the Earth's axis of 23.5degree which causes sun angles and daylight to vary.

16. The spring equinox in the northern hemisphere occurs on March 21.

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