" ... explains how the Earth's supply of nitrogen moves in different forms in a cycle from the air to the soil to living things; ... explain[s] such processes as fixation, nitrification, and dentrification, as well as the important role of bacteria in the nitrogen cycle; feature boxes [that] highlight examples of the ways in which human activity ... releases harmful greenhouse gases into the air interfering with the nitrogen cycle; and encourage[s] [readers] to find ways to take action and find solutions"--Provided by publisher.
