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Introduces the nitrogen cycle and how it works, discussing what nitrogen is, why living things need it, nitrogen in the air, nitrogen compounds, and the effect that humans have on the cycle.
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Book Description PowerKids Press, 2007. Library Binding. Condition: New. Seller Inventory # DADAX1404234918
Book Description Powerkids Pr, 2007. Condition: New. book. Seller Inventory # M1404234918
Book Description Powerkids Pr, 2007. Library Binding. Condition: New. Never used!. Seller Inventory # P111404234918