Earth Cycles

The Nitrogen Cycle: Of Microbes and Men

by John Arthur Harrison, Ph.D.

Further Exploration

Human Alteration of the Global Nitrogen Cycle

Ecological Society of America - An overview of the scientific understanding of human-induced changes to the global nitrogen cycle and the consequences.

Spheres of the Nitrogen Cycle

Illinois State Water Survey - More detailed information about how nitrogen passes through the atmosphere, biosphere, geosphere, and hydrosphere.

Nitrous Oxide Emissions

World Bank - a visual representation of the World Bank's nitrous oxide emissions dataset

Biography

Fritz Haber

Fritz Haber

News & Events

Algal Blooms and Eutrophication

Department of Ecology, State of Washington

Airplane exhaust may affect earth's climate

Science News Online

Current Science News

News from around the world of science.

Research

Google Scholar

Google - Research database allows searching of the scholarly literature.

Experiment!

Nitrogen Cycle Animation

State of Victoria (Australia) - this animation provides a simple illustration of the nitrogen cycle in an agricultural context.

Air Emission Sources - Nitrogen Oxides

Environmental Protection Agency (EPA) - a national database of air emissions information, including nitrogen oxides (NOx) emissions by source. View information on air quality standards, trends, health effects, and programs to reduce NOx.

Next Generation Science Standards (NGSS)

Next Generation Science Standards: For States, By States

National Academies Press: A Framework for K-12 Science Education