Because natural gas and oil are sources of hydrogen:
CH4 + O2 ===%26gt; 2H2 + CO
Hydrogen reacts with nitrogen of the air in the Haber-Bosch process to form ammonia:
N2 + 3H2 ===%26gt; 2NH3
Ammonia is oxidized to nitric acid in the Ostwald process:
NH3 + 2O2 ===%26gt; HNO3 + H2O
And ammonia reacts with nitric acid to form ammoium nitrate:
NH3 + HNO3 ===%26gt; NH4NO3
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