Q12 of 56 Page 79

Which of the following is not a greenhouse gas?

Ammonia contains no carbon and releases no greenhouse gases. The emission of direct and indirect greenhouse gases, namely methane (CH4), carbon dioxide (CO2), ammonia (NH3), nitric (NO) and nitrous oxide (N2O)

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One of the following processes is not a step involved in the water-cycle operating in nature

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The term “water-pollution” can be defined in several ways. Which of the following statements does not give the correct definition?

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Which step is not involved in the carbon-cycle?

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