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Card 6
Front
Which stage in the nitrogen cycle involves the oxidation of ammonium ions in to nitrite ions and the oxidation of nitrite ions into nitrate ions?
Back
Card 7
Front
Which stage in the nitrogen cycle involves the process by which nitrogen gas is converted into nitrogen-containing compounds?
Back
Card 8
Front
Which stage in the nitrogen cycle involves the use of denitrifying bacteria converting soil nitrates into gaseous nitrogen?
Back
Card 9
Front
Why is does soil need to be kept well aerated?
Back
Card 10
Front
What are the two main human activities that have led to an increase in carbon dioxide levels in the atmosphere?
Back
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