Figure 54.9
-How much nitrogen is fixed from human processes?
A)It is equal to the amount fixed by natural means.
B)It is about half that fixed by natural means.
C)It is about double that fixed by natural means.
D)We cannot calculate this value.

Question

Figure 54.9 
-How much nitrogen is fixed from human processes?
A)It is equal to the amount fixed by natural means. 
B)It is about half that fixed by natural means. 
C)It is about double that fixed by natural means. 
D)We cannot calculate this value.

Quizplus · Accepted Answer

Human processes such as the production of fertilizers and cultivation of legumes have increased the amount of nitrogen fixed by humans. However, it is estimated that human-caused nitrogen fixation is roughly half of the amount fixed naturally by bacteria and lightning.

Figure 54.9 -How Much Nitrogen Is Fixed from Human Processes